JEE-MAINNEW PATTERN QUESTIONS

2021

CHEMISTRY

RACE ACADEMY

yrk mohan presents

JEE MAIN-NEW PATTERN

CHEMISTRY NUMERICAL VALUE & INTEGER ANSWER TYPE QUESTIONS

1. A light of wavelength 200nm falls upon a surface and two different wavelength

photons 800nm and 400nm are emitted from the surface. 80% of the energy

absorbed is re-emitted in the form of photon. Number of photons emitted as 800nm

is 3 times that of number of photons emitted as 400nm . If the ratio of total absorbed

photon to total emitted photon is x. then find the numerical value of (12.8x)

Key: 5

2. A light of wavelength 3000 falls on a metal surface. Ejected e- is further accelerated

by a potential difference of 2V, then final K.E of the e- is found to be 198 10 J . If

threshold energy for the metal surface is ' ' eV. Then find the numerical value of 8 Key: 9

3. In H sample, e- is present in the orbit in which angular momentum of e- is 2h

.

Electron make transition upto ground state. If 3rd highest energy photon has energy of

X eV then approximate numerical value of 25x

is

Key: 4

4. In He ion sample e- is in ground state, if photon of energy 52.24eV is given to the

sample all the atom goes to higher energy state. It again falls back up to ground state.

If it is not emitting any lines in Balmer series then what is the maximum possible

number of spectral lines observed

Key: 6

5. An element with mass number 95 have 4 unit positive charge and 25% more

neutrons than electrons in the given ionic state. Its atomic number is Z,then

find the value of (Z/10) .

Key: 4

6. Atomic number of Hydrogen like species that has a wave length difference of 59.3 nm

between first line of Balmer and first line of Lyman series is?

Key: 3

7. If the number of significant figures in 100 , 100. and 100.0 are X, Y and Z

respectively. What is the value of X+Y-Z ?

Key: 0

8. The difference in the oxidation states of the two central atoms (N and Cl ) in pernitric

acid and perchloric acid is

Key: 2

9. Chloride samples are prepared for analysis by using KCl, NaCl, NH4Cl separately or

as mixtures. What minimum volume of a 5% (by weight) AgNO3 solution (sp

gravity=1.04) must be added to a sample weighing 0.1g in order to ensure complete

precipitation of chloride in every possible case? Round off your answer to the nearest

integer.

Key: 6

10. An element forms a hydride containing 5.928% hydrogen. 0.1794g of the gaseous

hydride occupies 118mL at STP. If equivalent weight of element is X and molecular

weight of the hydride is Y; then report 10

X Y to the closest integer

Key: 5

11. One mole of an ideal gas at 300K expands isothermally and reversibly from 10 atm to

1 atm. Then maxU H W q is equal to –

Key: 0

12. The mole fraction of each gas for the greatest G in a mixture of four ideal gases at

constant temperature and pressure is 1x

and x is-

Key: 4

13. An insulated container contains 1 mole of a liquid, molar volume 100ml,at 1 bar.

When liquid is steeply pressed to 100 bar , volume decreases to 99 ml . Then

2xH barL . x is (nearly) –

Key: 5

14. Two acid solutions A and B are titrated separately each with 25mL of 1N Na2CO3

solution. The volume of each acid used for titration are 10 ml and 40 ml respectively.

Find out the volume ratio of acid B and A respectively ,which should be mixed to

prepare 1mL of 1N solution .

Key: 4

15. The heat of vaporization of water and heat of fusion of ice are 540 cal/g and

80 cal/g. Then the ratio of vap

fus

SS

for water is (nearly)-

Key: 5

16. Calculate pH of a solution containing 0.1M HA 5a(K 10 ) and 0.1 M HCl

Key: 1

17. Calculate the percentage of hydrolysis in 610 M aqueous solution of NaOCN.

10bK for OCN 10

Key: 1

18. How much water (in L) should be added to 10g 3CH COOH to give pOH equal to

11. 5a 3K CH COOH 1.8 10

Key: 3

19. Calculate pH when 100 ml of 0.2 M NaOH is reacted with 100ml of 0.2 M

53 aCH COOH K 10

Key: 9

20. Calculate pH of a solution prepared by mixing 100ml of 0.2 M B Cl (aq) with

100 ml 0.1M NaOH. Given 5aK B 10

Key: 5

21. A mixture of formic acid and oxalic acid is heated in presence of 2 4H SO

H2HCOOH H O CO

H2 2 4 2 2H C O H O CO CO

The produced gaseous mixture is collected and cooled. On its treatment with KOH

solution the volume of gaseous mixture decreases by one-tenth. Calculate the molar

ratio of the two acid in original mixture. [If the simplest ratio is a: b then fill your

answer as a + b]

Key: 9

22. To 1 litre solution containing 0.2 M Al+3 and 0.2M Zn+2, NaOH is added slowly, if

concentration of 3Al is x16 10 at the time when 2Zn OH just begins to precipitate,

then find x? 25

sp 3K Al OH 16 10

13sp 2

K Zn OH 2 10

Key: 7

23. A container whose volume is V contains an equilibrium mixture that consists of

2 moles each of 5 3PCl ,PCl and 2Cl (all are gases). The pressure is 3 bar and

temperature is T. A certain amount of 2Cl (g) is now added, Keeping the pressure and

temperature constant, until the equilibrium volume is 2V. Calculate the moles of 2Cl

added upto the nearest integer.

Key: 7

24. Count the number of species which can act as Bronsted Lowry acid as well as base in

aqueous medium

2 4 2 3 2 2 3H PO ,H PO , H PO ,B OH ,HS

Key: 3

25. How many among the following aqueous solution can act as a buffer solution

(i) 100 ml of 0.1M 3CH COONa + 50 ml of 0.1M HCl

(ii) 100 ml of 0.1M 3CH COOH 50ml of 0.1 M NaOH

(iii) 100 ml of 0.1 M Borax solution

(iv) 100 ml of 1 M 3 4H PO + 150 ml of 1M NaOH

(v) 100 ml of 0.1 M 4NH Cl + 50 ml of 0.1 M NaOH

Key: 5

26. The weight of glucose dissolved in 100 grm of water produce same lowering of vapor

pressure as 1 gm urea dissolved in 50gm of water at same temperature is

Key: 6

27. At 300 k the half-life a sample of a gaseous compound initially at 1 atm is 100 sec.

When the pressure is 0.5 atm the half-life is 50 sec. The order of reaction is

Key: 0

28. At 025 C vapor pressure of volatile liquid ‘A’ in pure state is 60 torr. To 4 mole of ‘A’

‘X’ mole ‘B’ volatile liquid is added, at 025 C . The vapor pressure of resulting solution

was found to be 72 torr, and mole fraction of ‘A’ in vapor phase is 13

, the value of ‘X’

is

Key: 6

29. 0.5 m solution of a non-volatile, non-electrolyte solute in a volatile solvent boils at

332.012K and boiling point of pure solvent is 330K and it’s molecular mass is 40.

Find its molar enthalpy of vaporisatron

Key: 9

30. A 0.4m aqueous solution of xNa A has freezing point 03.72 C . If 2fK H O is .1.86K kg 1mol . The value of ‘X’ is (salt is 100% ionised)

Key: 4

31. The human body contains about 18% carbon by weight. Of total carbon, 101.50 10 %

is 14C (by weight). The number of disintegrations occurring per minute in a person of

70 kg is 10 yx . The value of (x+y) is nearly ( half- life of 14C is 5570 years)

Key: 7

32.

3 2

11 1 1

k k

kM M MA B C

If all the reactions in the above system give first order kinetics what is the rate of

disappearance of ‘B’ in the given instant

Key: 0

33. For a first order reaction 3g gA B the concentration verses time graph is given below

What is the half life in minutes (answer to the nearest integer) ?

(log 2= 0.3, log 3 = 0.48)

Key: 5

34. 238

92U disintegrates to give 4 6and particles. The group number of the daughter

element in modern periodic table is

Key: 3

35. For a reaction ,A B the rate law expression is 1/ 2d AK A

dt

. If initial

concentration of A is A0. The number of correct statements are

i) The plot of A against ‘t’ will be linear

ii) The half life period is 1/ 2 0

2 2 1t A

K

iii) The integrated form of rate expression is 02KA t A

iv) Time taken for reaction is decreased for second half life than first half life period

v) When concentration of reactant is doubled rate increases to 4 times at that instant

Key: 4

36. The rate constant of a reaction at 027 C is 3 13 10 min . The fraction of molecules

crossing the energy barrier of the reaction at that temperature is 310 % . If temperature

is increased, the maximum value of rate constant k can be attained is 1100minx . The

value of x is

Key: 3

37. Half life of a radioactive nuclide is 20 years. If a sample of this nuclide has activity of

6400 dpm today, its activity (in dpm) after 100 years would be x 100dpm ; the value

of ‘x’ is :

Key: 2

38. How many of the following ions have the same magnetic moments?

2 2 2 2, , , Fe Mn Cr Ni

Key: 2

39. The ion nA is oxidized to 3AO by 4MnO changing to 2Mn in acidic medium. Given

that 32.68 10 mole of nA requires 31.61 10 mole of 4MnO .Thus, n is

Key: 2

40. An organic compound undergoes first order decomposition. The time taken for its

decomposition to 18

and 110

of its initial concentration are 1/8t and 1/10t respectively.

What is the value of 1/8

1/10

10tt

210log 0.3

Key: 9

41. Calculate the Hp at which the following conversion (reaction) will be at equilibrium

in basic medium

2 3I s I aq IO aq

When the equilibrium concentration at 300 k are 30.10 0.10I M and IO M

0 , 50 /fGiven G I aq kJ mol

03 , 123.5 /fG IO aq kJ mol

02 , 233 /fG H O l kJ mol

0 , 150 /fG OH aq kJ mol

R (Gas constant)= 25 /3

J mol K

2.3}Log e Key: 8

42. The ratio of the inversion temperature of a gas to its Boyle temperature is

Key: 2

43. 102 kg of NH3 (g) was heated with 320 kg oxygen in the first step and HNO3 is

prepare according to the given reactions. If the final solution has volume 500 lt. Then

what is molarity of HNO3 solution.

4NH3 (g) + 5O2 (g) 4 NO + 6 H2O

2NO(g) + O2 (g) 2NO2 (g)

3NO2 + H2O (l) 2HNO3 (g) + NO(g)

Key: 7

44. Magnetic moment of a 3-d a series element ‘A’ is 4.92BM if magnetic moment of A2+

is also 4.92BM then what is the group number of A in modern periodic table

Key: 8

45. Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen

according to the equation 2H2O2(aq.) 2H2O(l) + O2(g), under conditions where one

mole of gas occupies 24 dm3, 100 cm3 of X M solution of H2O2 produces 6dm3 of O2.

X is thus –

Key: 5

46. Maximum individual oxidation number of Br-atom in Br3O8 is

Key: 6

47. Relative decrease in vapour pressure of an aqueous solution containing 2 moles

3 3 Cu NH Cl Cl in 3 moles of H2O is 0.50. On reaction with, AgNO3 how many moles

of AgCl will be precipitated.

Key: 1

48. How many of the following reactions are endothermic

(i) 4 4CH g C g H g (ii) 2 6 2 2 2C H O CO g H O l

(iii) Cl g e Cl g (iv) 2S g e S g

(v) Ne g e Ne g (vi) Li g e Li g

(vii) 2N g e N g Key: 4

49. A solution of 0.01 M HCOOH (ka = 2 × 10–4) and 0.01 M HCl has concentration of

HCOO– equal to 2 × 10–n. Then find the value of n

Key: 4

50. A non volatile solid P is dissolved in liquid X and progress of first order

decomposition P (in solution phase) X (l) + 2Q (g) is monitored by total pressure

measurement at 27°C. Data collected is:

0 10min20 80 100

Time t t t after long timeTotal pressure mm Hg mm Hg mm Hg

Calculate Half life of decomposition in minute.

Key: 5

51. Number of neutrons in a parent nucleus X, which gives 147 N after two successive

– emission would be :

Key: 9

52. A closed container of volume 0.02 m3 contains a mixture of Ne(A=20) and Ar(A=40)

at a temperature of 270C and a pressure of 105N/m2. If the total mass of mixture is 28

gm. Find the mass of Neon in grams.?

Key: 4

53. How many of the followings cations have non-inert gas configuration

4 2 3 2 2Tl ,Pb ,Hg ,Bi ,Pb ,Ag ,Cs , Be

Key: 6

54. What is the value of |x| + |y| where

x = lowest Possible formal charge on ‘N’ atom in Lewis structure(s) of azide ion( 13N )

y= highest possible formal charge on ‘N’ atom in Lewis structure(s) of azide ion

( 13N )

Key: 3

55. How many of the following molecule does not follow octet rule?

2 3 6 2 2 5, , , , , ,BeCl BF SF SF NO ClO PF

Key: 6

56. How many of the following molecules contain lone pair(s) on central atom in Lewis

dot structures?

2 4 3 2 3, , , ,NO SF O CO PCl Key: 3

57. The number of total electrons shared between nitrogen atoms in N2 is_____

Key: 6

58. Nitric Oxide decomposes through two parallel reactions

1K 12 2 1

1 1NO(g) O (g) N (g)K 8sec2 2

2K 12 2 2

1 1NO(g) O (g) O (g)K 4sec2 4

The reaction proceeds at constant volume. The initial mixture contained only nitric

oxide at a concentration of 4 Mol/Lt. Find the concentration (mol/lt) sum of 2N (g)

and nitrous oxide 2(N O) at 0.0575sec after the beginning of the reaction. (ln 2=0.69 )

Key: 1

59. At o25 C and 1 atm, 1 1P,MC 136 JK mol for benzene 6 6C H and 1 1

P,MC 156JK mol for

toluene 6 5 3C H CH . Find mix pC in 1 1JK mol when 100.0g of benzene and 100.0g of

toluene are mixed at o25 C and 1 atm to form an Ideal solution.

Key: 0

60. Carbon -11 , used in medical imaging, has a half-life of 20 minutes. The carbon-11

nuclides are formed, and the carbon atoms are then incorporated into an appropriate

compound. The resulting sample is injected into a patient, and the medical image is

obtained. If the entire process takes 53

hours, what percentage of the original carbon-

11 remains at this time ? Represent the answer upto the nearest integer.

Key: 3

61. The electronic configuration of few elements has been given. Total number of

elements that belongs to s-blocks is

i) 10 2Kr 4d 5s

ii) 10 1Xe 5d 6s

iii) 2 10 6 2Kr 5s 4d 5p 6s

iv) 21s

v) 2 14 10 6 1Xe 6s 4f 5d 6p 7s

vi) 14 0 2Xe 4f 5d 6s Key: 3

62. According to Kossel-lewis theory of chemical bonding numbers of corners of cube

that are occupied by valence electrons of N-atom are

Key: 5

63. Maximum number of hydrogen bonds a water molecule can form in ice ?

Key: 4

64. Number of hydrogen bonds in 9 4H O species is

Key: 3

65. The sum of number of sigma and pi bonds formed between two carbon atoms in 2CaC

are:

Key: 3

66. Number of pi-bonds in 2B is:

Key: 1

67. How many of the following statement(s) is/are true ?

1) During 2N formation, from N2 one electron is removed from the bonding molecular

orbitals

2) During 2O formation, from O2 one electron is removed from the antibonding

molecular orbital.

3) During 2O formation, from O2 one electron is added to the bonding molecular

orbital.

4) During CN formation, one electron is added to the bonding molecular orbital.

5) 1s molecular orbital has only one nodal plane.

6) *1s molecular orbital has only one nodal plane.

Key: 4

68. How many of the following metals can be detected in the laboratory through flame

test

i)Be ii)Mg iii) Na iv) K v)Ba

Key: 3

69. How many of the following produce H2(g) on reaction with NaOH –

B, Si , Al, Zn, Cl2, SnCl2 , ,HNO3, PbO2, H2S

Key: 4

70. How many of the following orders are given correctly

i) Order of stability 2 2 2 2CsO RbO KO NaO

ii) Order of melting points LiF LiCl LiBr LiI

iii) Order of density Cs Rb Na K Li

iv) Order of standard enthalpy of formation ( Only magnitude)

LiF NaF KF RbF CsF

v) Order of standard enthalpy of formation (Only magnitude)

CsLiCl NaCl KCl RbCl Cl

vi) Order of solubility LiOH NaOH KOH RbOH CsOH

vii) Order of solubility 4 4 4 4BeSO MgSO CaSO BaSO Key: 6

71. At 375K sodium carbonate exist as 2 3Na CO . 2xH O then x is

Key: 1

72. How many of the following metals whose nitrate salts decompose to give mixture of

2 2

( )g gNO and O

i) Li ii) Na iii) Ca iv) K v) Mg

vi) Sr vii) Ba

Key: 5

73. How many of the following molten state compounds liberate hydrogen gas at anode

during electrolysis using platinum electrodes

i)NaH ii) KH iii) RbH iv) CsH

v) 2BeH vi) 2CaH Key: 5

74. How many of the following exist only in solution state

i) 3LiHCO ii) 3NaHCO iii) 3KHCO iv) 3 2( )Mg HCO

v) 3 2( )Ca HCO vi) 3 2( )Ba HCO vii) 3RbHCO viii) 3CsHCO Key: 4

75. How many of the following under go disproportionation on reaction with NaOH

i) 2Cl ii)S iii)P (White) iv) B

v) Si vi) Al Vii) Hg

Key: 3

76. A solution of weak acid was titrated with base NaOH. The equivalence point was

reached when 36.12 ml of 0.1M- NaOH have been added. Now, 18.06ml 0.1M-HCl

was added to the titrated solution, the pH was found to be 5.0. the pKa of acid is

Key: 5

77. Hydrogen peroxide solution (20ml) reacts quantitatively with a solution of 4KMnO

(20ml) acidified with dilute 2 4H SO . The same volume of the KMnO4 solution is just

decolourized by 10 ml of MnSO4 in neutral medium, simultaneously forming a dark

brown precipitate of hydrated MnO2. The brown precipitate is dissolved in 10ml of

0.2M sodium oxalate under boiling condition in the presence of dilute H2SO4. The

strength of H2O2 solution in mg per 10 ml solution is (if “xy” the |x+y| is)

Key: 7

78. Find the number of effusion steps required to separate the isotopic mixture initially

containing some mass of hydrogen gas and 1 mole of deuterium gas in a 3 litre

container maintained at 24.63 atm and 300K to the final mass ratio of hydrogen to

deuterium gas equal to 4 : 1

Key: 4

79. An amount Q of heat is added to a monoatomic ideal gas in a process in which the

gas performs a work Q/2 on its surrounding. The molar heat capacity of gas (in cal/K-

mol) for the process is

Key: 6

80. The enthalpies of neutralization of a weak acid HA and a weak acid HB by NaOH are

-6900 cal/equivalent and -2900 cal/equivalent, respectively. When one equivalent of

NaOH is added to a solution containing one equivalent of HA and one equivalent of

HB, the enthalpy change was -3900 cal. If the base is distributed between HA and HB

in the ratio of 1:x, the value of ‘x’ is

Key: 3

81. When 1.0 of mole of H2(g) and 3.0 moles of I2 vapours are allowed to react, ‘x’ moles

of HI(g) is formed at equilibrium. Addition of a further 2.0 moles of H2(g) gave an

additional ‘x’ moles of HI(g) at new equilibrium. The value of equilibrium constant

for the reaction: 2 2 2H g I g HI g is

Key: 4

82. Potassium on burning in air forms compounds ‘X’. X on hydrolysis forms a solution

and releases a gas, How many antibonding electrons are present in the gas?

Key: 6

83. How many of the following compounds are polar ?

CH3Cl, NH3, CO2 , H2O , CH4 , PCl5 ,C2H2 ;

Key: 3

84. The diffusion coefficient of an ideal gas is directly proportional to its mean speed and

to its mean free path. The absolute temp of an ideal gas is increased 9 times and its

pressure is increased 3 times, due to which diffusion coefficient increases x times. The

value of ‘x’ is ______

Key: 9

85. A hydrogen atom in its ground state is irradiated by light of wavelength 972.5A .

Taking 6hc 1.237 10e

evm and the ground state energy of hydrogen atom as -13.6 ev,

the number of lines present in the emission spectrum is__________.

Key: 6

86. Assuming there no 2s – 2p mixing, the number of paramagnetic species amongst the

following: 2

2 2 2 2 2 2 2 2 2 2 2 2 2H , He , Li , Be , B ,C ,C , N , N ,O ,O ,S & F

are _______________.

Key: 6

87. The acid ionization (Ka) hydrated 3Al ion 32 6Al(H O) is 52 10 for the reaction,

2

32 6 2 2 3 (aq)5 (aq)

Al(H O) (aq) H O( ) Al H O OH H O

The pH of a 0.05M aqueous solutions of 3AlCl is __________

Key: 3

88. How many milliliters of 0.05M 4 6K Fe CN solution are required for titration of

60 ml of 0.01 M 4ZnSO solution, when the product of reaction is 2 3 6 2K Zn Fe CN ?

Key: 8

89. Out of , , , ,Be Mg Ca Sr and Ba number of elements which do not impart any colour to the

flame, is

Key: 2

90. On heating a mixture of 8 moles of 2 3Li CO and 3KHCO in 3: 1 ratio, the number of

moles of 2CO liberated is

Key: 7

91. 2 2Na O is a strong oxidizing agent. It oxidized chromic compounds into chromates.

How many moles of 2 2Na O are required to convert two moles of 3Cr OH into sodium

chromate?

Key: 3

92. In the compound 2 4 5 24 .8Na B O OH H O , if the

i)number of B-O-B bonds is’x’

ii)number of B-B bonds is ‘y’

iii)number of 2sp hybridized B atoms is’z’

Calculate the value of x+y+z.

Key: 7

93. 1 mole of 2 6B H g on hydrolysis yields………moles of 2H g .

Key: 6

94. Find the number of B-O bonds in peroxoborate.

Key: 8

95. How many of the following species have permanent dipole?

3 2 2 2 4 3 2 3O ,CO,CO , NO , N O,CH ,CFCl ,XeF ,ClF

Key: 6

96. The collision diameter for helium is 207 pm and for methane, 414 pm what is the ratio

of mean free path of He compare to that with methane under the same conditions?

Key: 4

97. 1 ml of 1 mol/L hydrochloric acid was diluted to 100 mL with water 10 mL of this

solution was further diluted to 100 mL with water. What is the Hp of the final

solution.

Key: 3

98. The number of species with fractional bond order is x and the number of paramagnetic

species are y. The value of | x y | is:

2 2 2 2 2 2 2B ,C , N ,O ,O ,He ,C

Key: 2

99. In the model of hydrogen like atom put forward by Niels Bohr (1913), the electron

orbits around the central nucleus. The Bohr radius of nth orbit of a hydrogen like

species is given by 2nr k

z where k is a constant. Find number of correct statement (s)

1. The principal quantum number, n of the orbit of 3Be that has the same Bohr radius

as that of ground state of hydrogen is 2.

2. The ratio of total energy of an electron in the ground state of 3Be ion to that of

ground state of H atom is16.

3. The ratio of de Broglie wave length of electron in the ground state of 3Be ion to

that of ground state of H atom is 2.

4. The ratio of time period of an electron to complete one cycle in the ground state of

3Be ion to that of ground state of H atom is 116

.

Key: 3

100. A closed vessel with rigid walls contains 1 mol of 23892 U and 1 mol of air at 298K.

Considering complete decay of 23892 U to 206

82 Pb , the ratio of the final pressure to the

initial pressure of the system at 298 K is?

Key: 9

101. How many of the following salts form an insoluble hydroxide with aqeous NaOH that

are soluble in excess NaOH ?

3 2 2 3 4 3AlCl ,SnCl ,PbCl ,CrCl , ZnSO ,FeCl Key: 5

102. Malonic acid 4 100150

P OC

Foul smell 0200 CA B +Carbon

The total number of sigma and Pi bonds present in the compound A are: ........

Key: 8

103. In cyclic silicate ion 126 18Si O the number of oxygen atoms shared are: .........

Key: 6

104. The number of oxygen atoms not acting as bridges (Si-O-Si) in the mineral kinoite

.22 2 3 10 2Ca Cu Si O H O .

Key: 8

105. How many of the following species have 2sp hybrid atoms?

Diamond, Graphite, 6 3 3 3 2 33 6, ; ; ; ;OC SiH N AlF AlCl monomer Al CH SiC , 3 3H BO ,

layered BN, Borazine.

Key: 7

106. How many of the following compounds are amphoteric?

2 3 2 2 2 2, ; : , , , , ,CO Al O SiO GeO SnO SnO PbO PbO CO Key: 5

107. How many of the following reactions produce a paramagnetic gas?

3 2AlH H O

2 3 2Al O C N

2AlN H O

. 2 42

Conc H SOH O

HCOOH

. 2 42 2 2

Conc H SOH O

CH COOH

2 5CO I O

2 3Fe O C Key: 0

108. In how many of the following reactions hydrogen gas is produced as one of the

product.

(i) Electrolysis of acidulated water

(ii) Passing steam over red hot coke.

(iii) Reaction of aluminium with sodium hydroxide

(iv) Reaction of Zinc with dil HCl

(v) Pyrolysis of hydrocarbons

(vi) Reaction of sodium amalgam with water.

(vii) By dissolving hydrolith in water.

(viii) By heating a mixture of steam and hydro carbons

(ix) Electrolysis of brine.

Key: 9

109. How many of them are 3-D silicates?

Feldspars, Ultra marines, Zeolites, Pyroxenes, Amphiboles, Beryl, Zircon, Asbestos

Key: 3

110. X = Oxidation, state of carbon in CO

Y = Oxidation state of carbon in COCl2

They y x is:

Key: 2

111. How many of the following reactions lead to the formation of CO as one of the

products?

2 . 2 4;

Conc H SOCOOH

. 2 4;

Conc H SOHCOOH

2 3 2Al O C Cl 4 6 2 4;dilute

H SOK Fe CN

4Ni CO 2 3B O C Key: 5

112. In how many of the following are hydrogen bonding (.......) possible in any of the

physical states

1) O H .....N 2) O H ......Cl 3) N H .....Cl

4) N H .....S 5) C H .....O 6) O H .....F

Key: 6

113. Coordination number of tin in the product formed in the reaction of tin with hot

concentrated aqueous solution of sodium hydroxide is?

Key: 6

114. An equilibrium mixture contain equal moles (n) of each 5 3 2,PCl PCl and Cl .If 203

mol

of 2Cl g is added at equilibrium at constant temperature and pressure, volume of the

system is double. What is n?

Key: 2

115. Consider the following first order decomposition process

Here “t” corresponds to the time at which 16

th

of reactant is decomposed the value of

‘n’ is

Key: 5

116. The number of alkali metals directly react with ‘C’ forms carbides

Li, Na, Be, Mg, Al, Sr, Ba, Ca, B, Si

Key: 1

117. No of metamers from the following molecules whose molecular formula is C6H12O

is/are........

3 2 2 2 3CH CH CO CH CH CH 3 3CH CO CH CH

3CH

3 2 2 2 2CH CH CH CH CH CHO 3CH3 2 3CH CH CO CH CH

3CH3 2 2CH CH CH CH CHO

3 2 2 2 3CH CO CH CH CH CH

3CH3 2 3CH CO CH CH CH

3CH3 2 3CH CO CH CH CH

3CH3 3CH CO C CH

3CH

3CH

3CH3C CO C CH

3CH3CH

3CH

Key: 6

118. The number of structural isomers of 4 10C H O is ‘X’ and for 2 6C H O is ’Y’.

Then the X + Y is..

Key: 9

119. The number of correct IUPAC names for the given compounds is..

i) 3 2 3CH CH CH CH C C CH : hept-2-en-5-yne.

ii) 2 2CH CH CH C CH : pent-1-en-4-yne.

iii) 3 2CH CH CH CH C CH : hex-4-en-1-yne.

iv) 2 2 3CH CH CH C C CH :hex-5-en-2-yne.

v) 3 33 3CH C CH CH C CH :1,2-di( 03 -butyl)ethene.

vi) 2 2NC CH CH CH CN

CN : propane -1,2,3-tricarbonitrile.

vii)

2CH CHO

: benzeneacetaldehyde.

Key: 4

120. The number of structural isomers possible for 6 6 3C H O containing benzene ring

(Do not consider peroxybond containing isomers) is X.

The number of structural isomers possible for 7 9C H N containing benzene ring is Y.

Then X + Y is....

Key: 8

121. The number of cyclic isomers for 5 10C H is ‘X’ and the number of open chain structural

isomers for 5 10C H is ‘Y’. Then X Y is..

Key: 0

122. How many orders are correct match?

(i) Boiling point: PH3 < AsH3 < NH3 < SbH3

(ii) Dipole moment: CH3F > CH3Cl > CH3Br

(iii) Bond angle: H2O < OF2 < OCl2

(iv) Solubility: BeSO4 > MgSO4 > CaSO4 > SrSO4 > BaSO4

(v) Acidic strength: Al2O3<B2O3 < SiO2 < CO2

Key: 4

123.

2

2

3

N

CaCO X CO

Carbon

Y Z

The number of lone pair electrons in the anion present in Z is ..

Key: 4

124. Energy required to stop the ejection of electrons from Cu-plate 0.27 eV.

Calculate the work function (in eV) When radiation of 235nm strikes the plate.

Key: 5

125. What is the oxidation number of thallium in the complex formed by the addition of

excess potassium iodide to thallium iodide in alkaline medium.

Key: 3

126. Some % of sample of 2N must be allowed to escape off. Its temperature, pressure and

volume are to be changed from 0220 C , 3 atm, 2L to 0110 C , 0.6 atm and 1L

respectively. If answer for % is mn % , what is the value of m n ?

Key: 1

127. How many chiral centres are present in the following compound?

Key: 6

128. Examine the following structural formulae and select those that are chiral.

a) C C C

HH

CH3 CH3

b)

H

H

C H 3

C H 3C l

C l

c)

d)

N

H

e) f)

g) h) i)

Key: 8

129. A 2:3 racemic mixture (by weight) has an observed specific rotation of 16º. The

specific rotation of the optically pure component is 10x degrees where x is

Key: 8

130. How many of the following acids are more acidic than acetic acid?

2FCH COOH , 2 2 6 5 2 2, , ,DCH COOH HOCH COOH C H COOH O N CH COOH Key: 4

131. Total number of stereo isomers 3 3CH CH D CH for the given compound is/are

Key: 4

132. on monochlorination give X number of isomeric products which on

fractional distillation give Y number of isomeric products. Find the value of 2 ?X Y Key: 0

133. How many statements are correct?

1. Trans cycloctene is chiral due to presence of chiral (stereo) axis.

2. Bulkiness order at ortho positions in Biphenyl system follow

3 2Br CH Cl NO

3.

OH

is an optically active compound

4.

OH

OHHO

HO

COOH

COOH is a meso compound due to plane of symmetry

Key: 1

134. Find the number of incorrect statements

I. Meso tartaric acid has different melting point than (+) Tartaric acid

II.

and

are conformational diastereomers

III.

MeO

NH

NH

H

H

OMe

is optically active molecule

IV.

N

this molecule has chiral centre and shows optical activity

Key: 1

135. How many of the following statements is/are true?

a)

IUPAC name of

NO2

Cl

CH3 is 2-chloro-1-methyl - 4 - nitrobenzene.

b) Amino acids may be detected by spraying the TLC plate with

ninhydrin solution.

c) Nitrogen, sulphur, halogens and phosphorus present in an organic

compound are detected by lassaigne's test.

d) Duma’s method is not applicable to nitrobenzene.

e) CCl4 do not give white ppt of AgCl on heating it with silver nitrate

solution.

f) It is necessary to use acetic acid and not sulfuric acid for acidification

of sodium extract for testing sulphur by lead acetate test.

g) In pyridine, all atoms lie on same plane.

h) No of dichloro derivatives of benzene is 2.

i) Azobenzene shows diastereomerism.

Key: 8

136. No of meso compounds possible for the following given compound is/are……..

OH

OH

OH

OH

OH

OH

Key: 7

137. For the first order reaction, t99.99% = xt90% then find the value of x

Key: 4

138. The heats of neutralisation of NH4OH by HNO2 and HCl are 8.6 and

13.3 kcal mol–1, respectively and that of NaOH by HCl is 13.7 kcal mol–1. Then the

heat of neutralisation of NaOH by HNO2 (in kcal mol–1) is

Key: 9

139. The number of orbitals in He+ ion having the energy = – 6.04 eV is

Key: 9

140. How many of the following elements react with Nitrogen directly to form a product

that liberates ammonia when treated with water.

Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, B, Al

Key: 8

141. How many of the following binary compounds exist in polymeric state in solid phase.

BeH2, MgH2, AlH3, AlCl3, SiS2, SiO2, Silicones, Silicate and born nitride

Key: 7

142. How many of the following species do not contain lone pair of electrons on the central

atom

Key: 8

143. The value of the de Broglie wave length of mono atomic Gas ‘X’ at 73 C is ‘M’

times that of the de Broglie wave length of mono atomic Gas ‘Y’ at 727 C . Find M?

(Given Molar masses of ‘X’ and ‘Y’ are in ratio 1:5)

Key: 5

144. The number of total isomers of biphenyl dichloride are X. Find the value of Y, where

Y= X-3 and fill in your response sheet

Key: 9

145. How many of the following are soluble in excess of NaOH -

2 3 2 2Ca OH ,Al OH ,Sn OH , Pb OH , 3 2 2 3Cr OH , Zn OH , Be OH ,Fe OH Key: 6

146. Number of equilateral triangle faces in truncated tetrahedron are_____

Key: 4

147. 2 3A B dissociates in 3A and 2B ions in an aqueous solution, with a degree of

dissociation ( ) 0.5 . The ratio of the observed elevation of boiling point of the

aqueous solution to the value of the depression of freezing point (hypothetical) in the

absence of ionic dissociation for the same molality is ‘R’. Find value of 8R?

2 2b(H O) f (H O)K 0.5,K 2 Key: 6

23 3 2 2 3 2 3 2 2 2 3, , , , , , , , , ,NO CO NO BO SO SO SO CO CS SiS BCl

148. Find out number of aromatic compounds or ion from following.

NH

OO

Key: 6

149. The purine heterocycle occurs mainly in the structure of DNA. Identify number of ‘N’

atoms having localized lone pair of electrons.

N

N N

NH

(Purine) Key: 3

150. How many resonating structures are possible for the compound?

O

(Furan) Key: 5

151. Find out number of compounds which have stable ionic structure, from following.

, , , ,

O O O

Key: 3

152. Find out number of benzylic hydrogen in....................

Key: 5

153. Number of maximum benzenoid structures which can be present in a particular

resonating structures of phenanthracene are ....................

Key: 3

154. Bromine and chlorine are taken in a container to attain the following equilibrium at

250C 2 2 2 ; 1pBr l Cl g BrCl g K atm . Initially 1 mole of Cl2 was taken and at

equilibrium partial pressure of BrCl is 0.1 atm. If vapour pressure of Br2 is 0.25 atm

then find minimum number of moles of Br2 required to attain this equilibrium.

Key: 5

155. 3Al OH is involved in two equilibrium given below.

3

3 3 pSAl OH Al OH K

3 4 CAl OH OH Al OH K

For minimum solubility of 3,Al OH OH concentration is given by

1z

sp

c

x KOH

y K

then find the value of ?x yz

Key: 1

156. When 2Be OH is evaporated with acetic acid, a compound ‘A’ is formed. If x=no. of

acetate ions in ‘A’ and y=no. of Be (atoms/ions) in ‘A’, then find x-y

Key: 2

157. Observe the compound ‘A’

Cl

OH OH If in this compound

a= total no. of chiral C-atoms

b= No. of optically active isomers

c = No. of optically inactive isomers

d = No. of geometrically orientations in space

Then find ?a c b d Key: 0

158. 1 gm of a mono basic acid (hypothetical acid) when dissolved in 100 gm of water

lowers the freezing point by 0.18540C. 0.2 gm of same acid when dissolved and

titrated required 20ml of 10N alkali. Calculate degree of dissociation (%) of the acid

2 1.8fK H O Key: 3

159. The concentration of cholesterol dissolved in chloroform is 6.15gm per 100 ml

solution. A portion of this solution in a 5cm polarimeter tube causes an observed

rotation of –1.20. if 10 ml of the solution is diluted to 20 ml and placed in same tube

then observed rotation is –m× 10-1. Find value of m=?

Key: 6

160. An electron and positron are orbiting about their common centre of mass. The

Rydberg’s constant for this system is Rnew while for hydrogen like species its R . Find

the value of ?New

RR

Key: 2

161. In 3 4LiCH , xc ye type bond is present between Li & ‘C’ or 3CH group then

value of |x-y| is-

Key: 2

162. Which of the followings are less soluble than KCl-

4 3 2BaSO , NaHCO ,LiCl,CsCl,LiF,Mg OH

Key: 5

163. Bronsted Basicity of aqueous boric acid is-

Key: 0

164. Number of stereoisomer of the following compound that has a different melting point:

CO2HHO2C

Key: 1

165. How many different chloroethanes are there from the formula 2 6 n nC H Cl (where n can

be any integer from 1 to 6)

Key: 9

166. Molecule [X] contains only carbon, hydrogen and a single oxygen atom. If [X] is a

ketone, what is the smallest number of carbon atoms needed for it to be chiral

Key: 6

167. A sample of hydrogen atom in ground state is irradiated by light of wave length0

970A .

Taking 6hc 1.237 10 eVm and the ground state energy of hydrogen atom is

– 13. 6 eV, the maximum number of lines present in the emission spectrum is:

Key: 6

168. The enthalpy of formation of 2 5C H OH( ) is – 66 kcal/mol. The enthalpy of combustion

of 3 3CH OCH (g) is – 348 kcal/mol. Enthalpy of formation of 2H O and 2CO are

– 68 kcal/mol and – 94 kcal / mol respectively. Then the H isomerisation of

2 5C H OH into 3 3CH OCH (g) is11x kcal / mol . The value of ‘x’ is:

Key: 2

169. The following rate data were obtained at 303 K for the following reaction.

A B C D

Experiment 1A / molL 1B / molL Initial rate of

formation of 1 1D / molL min

I 0.1 0.1 36.0 10

II 0.3 0.2 27.2 10

III 0.3 0.4 12.88 10

IV 0.4 0.1 22.4 10

Calculate rate constant of the reaction. (in terms of mol/L & min)

Key: 6

170. Air contains 2O and 2N in the molar ratio of 1:4. Calculate the ratio of solubility in

terms of mole fractions of 2N and 2O dissolved in 2H O at atmospheric pressure at

room temperature at whichHenry’s constant for 2O and 2N are 73.30 10 torr and 76.60 10 torr respectively.

Key: 2

171. Among the following reactions select those in which 20 halide is the major product?

A) 2Br /h

B)

CH3

2Br /h

C)

CH3

2Br /h D)

CH3

CH3 CH3

2Br / h

E) 2Br /h

F) CH3 CH32Br /h

Key: 3

172. Find the total number of isomeric products X in the following reaction and mark (X-5)

in your response sheet

Key: 7

173.

CH3

CH3

CH3

2Cl /hN(isomeric products) 5 11C H Cl fractional distillation M(isomeric products)

Find the value of M

Key: 4

174. How many transition states are involved in the following dehydration of alcohol.

OH

2 4conc.H SO /

Key: 5

175. CH3

CH3

OH

2D /PdH M N

Find the value of M+N?

Key: 8

176. Identify how many of the following reactions are correctly matched with their major

product.

A)

CH3CH3

mCPBA

Me

Me

OHH

OHH

B)

CH3 Et 2

4

BrCCl Et

CH3

Br

Br

C)

CH3CH3

HBrperoxide CH3CH3

Br

D) CH2CH3 CH3

Cl

HClperoxide

E)

CH3 CH3 CH3CH3H H

2 2CH IZn(Cu )

Key: 3

177. Number of reactions in which alkane is formed as major product:

A) 4LiAlH B) 4NaBHDMF

C) Cl

NaOEtEtOH D) 4NaBH

DMF

E) 3NaOH CaOCH COOH

F) 2 4 2 2/N H H O

Key: 5

178. 100 ml of 2 4/10M H SO , 200 ml of 2 3/ 5M Na CO and 150 ml of / 3M HCl are

mixed together . The number of mill moles of ortho-phosphorous acid ( 3 3H PO )

required to neutralise this solution (assume 1 for all participants in ionization

throughout)

Key: 5

179. A single electron system has ionisation energy in its ground state of -11808 kJ/mol the

number of protons in the nucleus of system will be:

Key: 3

180. Enthalpy of solution of anhydrous 4CuSO is -15.9kcal/mol and enthalpy of hydration

of anhydrous 4CuSO to form 4 2CuSO .5H O is -18.9 kcal/mol. Then the enthalpy of

solution of 4 2CuSO .5H O in kcal/mol is:

Key: 3

181. How many out of the following reactions, can give aromatic product?

1) S2CH CH M

Br

Br

Br

CH3 D

CH3 D

2) 2 2CH NCH CH N

3) Red HOtFe(or )Cu tube3CH CH O

4) m CPBACH CH P Key: 3

182. CaC2

H2OA

red hot iron873 K

B

O

O

OAlCl3

C(i) Zn-Hg/HCl

(ii) H3PO4W

Find the number of oxygen atoms in W.

Key: 1

183. Among the following, the number of aromatic compound(s) is

Key: 5

184. Examine the structural formulas shown below and find out how many compounds can

not give Friedel Crafts reaction.

CH3 NH2HO F

OHO3NH C N

, , , , , , ,

Key: 5

185. Examine the structural formulas shown below and find out how many compounds will

show side chain oxidation reaction with acidic 4KMnO

CH3 CH3CH3

CH3

CH3CH3

CH3CH3

CH=CH 2PhPh

Ph

C CH

, , ,

, , ,

Key: 5

186. In how many of the following pairs the former is more reactive than later with sodium

methoxide in methanol at 500C?

(i) Chlorobenzene and o-chloronitrobenzene

(ii) p-chloronitrobenzene and m-chloronitrobenzene

(iii) 4-chloro-3-nitroacetophenone and 4-chloro-3-nitrotoluene

(iv) 2-fluoro-1,3-dinitrobenzene and 2-chloro-1,3-dinitrobenzene

(v) 4-chloronitrosobenzene and 4-chloroanisole

(vi)2-iodo-1-(trifluoromethyl)benzene and 2-fluoro-1-(trifluoromethyl)benzene

Key: 4

187. Number of possible monochloro substituted products obtained from the reaction, of

3 32 2CH CH CH CH is,

Key: 3

188. A chloroderivative (X) on treatment with Zn-Cu couple in ethanol gives a

hydrocarbon (Y). When (X) is dissolved in ether and treated with sodium, 2, 2, 5, 5 -

tetramethylhexane is obtained. Identify how many different types of hydrogen atoms

are present in Y.

Key: 1

189. When 3,3 dimethyl 2- butanol is treated with HBr the number of 03 carbons present in

the major product formed is.

Key: 2

190.

CH3

If mono chlorinated through free radical substitution reaction, the total number of

possible isomers (Including stereo isomers) that can be formed for the above

compound is (X) which on fractional distillation gives (y) fractions. Find (x-y).

Key: 4

191. How many moles of AgNO3 will react with one mole of given compound?

Br

Br

Br

Br

Br

Key: 2

192. How many of the following are less reactive than CH3CH2I in a 2SN reaction?

(i) MeI (ii) CH3CH2CH2Br (iii) CH3CH2CH2CH2Cl

(iv) Me2CHI (v) Me2CHCH2I (vi) CH2 = CH–CH2I

(vii) PhCH2I

Key: 4

193. At room temperature how many of the following compounds can decompose 3NaHCO

to liberate 2CO ?

A) B) C) D)

E) F) G) H)

2CH C OH

OH

O

Key: 3

194. How many of the following compounds give Reimer-Tiemann reaction?

(a) (b)

CH2OH

(c)

(d) (e)

OH

CH3 (f)

OH

OH

Key: 4

195.

O

O

+

O

O

3 2

2

1. /2.AlCl CS

H O product mixture

How many compounds are exist in the product mixture?

Key: 4

196. The diazonium ions give diazo-coupling with phenol in the presence of dilute NaOH.

How many of the following are more reactive than Benzene diazonium chloride?

Key: 2

197. Number of bromine atoms in A are X, therefore X is

Key: 1

198. How many of the following ethers cannot be prepared by Williamson’s synthesis?

6 5 2 5 6 5 3 6 5 2 6 5 6 5 6 5

3 3 3 33 3, 3

, , , ,C H OC H C H OCH C H CH OC H C H OC HCH C O C CH CH C O CH

Key: 2

199.

2

2 2

FeH O

OH

3C H C lK O H

OHCHO

2 2(i) alkaline H O(ii)H X

The number of hydroxyl groups present in the product X is/are

Key: 2

200.

Number of moles of HI consumed per mole of (A) is X. Identify the value of X

Key: 0

201. 2 5

3

C H ClZnPhenol X YDust Anhydrous AlCl

(Monoalkylated product); the number of structural

benzenoid isomers of Y (including Y) are

Key : 4

202.

Five membered ring is major product then the sum of degrees of alcoholic groups

present in P is

Key: 4

203. An electrolysis of a oxytungsten complex ion using 1.10 A for 40 min produces

0.838 g of tungsten. What is the charge of tungsten in the material?

(Atomic weight: W=184)

Key: 6

204. How many of the following statements are correct?

A) cellE of any concentration cell is equal to zero.

B) In galvanic cell, electrons flow takes place from anode to cathode through external

circuit.

C) G of galvanic cell is temperature independent

D) Dilute 2 4H SO electrolysis between Cu electrodes produce 2SO at anode.

E) Cathode is negative electrode and anode is positive electrode in galvanic cell.

F) 1faraday electricity deposits 1 g-equivalent of a substance in the electrolysis.

G) Ions of inert electrolyte in salt bridge do not participate in electrochemical change

H) Cl2(g) and H2(g) are produced at anode and cathode respectively during

electrolysis of NaCl (aq) with Pt electrode

Key: 4

205. A cell 2/ / / /Cu Cu Ag Ag initially contained 2M Ag and 22M Cu ions in 1 L solution

each.The change in cell potential after it has supplied 1A current for 96500 sec was

found to be 210x V. Here x is:

Key: 2

206. If we assume the concentration of all the species as unity then at certain pH=0.2y the

emf values of both of the following two half cell reactions is same, then y (numerical

value) is __

3 2 ,NO NH OH (Acidic medium, 0 0.74E v ) and

3 2NO NO (Acidic medium, E0=0.80V) Key: 6

207. An alloy of Pb-Ag weighing 1.08 g was dissolved in dilute 3HNO and the volume

made to 10 mL. A silver electrode was dipped in the solution and the emf of the cell

set-up, 0( ) 2( ) ( )| (1 ) (1 ) ( ) 0.62 .s g s cellpt H atm H M Ag aq Ag was V If E is 0.80 V,

what is the percentage of Ag in the alloy? 0( 25 , / 0.06)At C RT F (Give your answer of

the multiplying with 10)

Key: 1

208. A solution containing 41M XSO aq and 41M YSO aq is electrolysed. If conc. Of X2+ is

10-z M when deposition of Y2+ and X2+ starts simultaneously. Calculate the

value of Z.

Given: 2.303 0.06RTF

2 20 0

| |0.12 ; 0.24

X X Y YE V E V

Key: 4

209. When a molten salt was eletrolysed for 5 min with 9.65A current, 0.18g of the metal

was deposited. Calculate the Eq. wt. of metal.

Key: 6

210. Current efficiency is defined as the extent of a desired electrochemical reaction

divided by the theoretical extent of the reaction. If this current efficiency fraction of

an electro deposition of Cu metal from 4Cu SO solution in which 9.8 g. Cu is deposited

by passage 3A current 10000 seconds is x? Give the nearest integer value w.r.t x?

Key: 1

211. A saturated solution of silver bromide is made in 7310 M AgNO solution

Given: spK of 133 10AgBr

3 2 16 10m Ag S m mol

3 2 13 7 10m NO S m mol

3 2 18 10m Br S m mol

For water, 6 17.5 10k S m

The conductivity of solution is x×10-7 S m-1. The value of x/20 is…..(adjusted to

nearest integer)

Key: 8

212. An aqueous solution containing 2 moles of NH4Cl is completely enclosed between

two electrodes which are 20cm apart, offers a resistance of 100 ohm. Calculate molar

conductance of NH4Cl(aq) (in S cm2mol-1)

Key: 4

213. Conductivity of a saturated solution of 2 6Cu Fe CN after subtracting the

conductivity of water is 5 1 11.28 10 cm . Calculate value of solubility of

2 6Cu Fe CN .

2 1 2 1 2 14 2 4 4 6260 , 300 , 720m m mCuSO S cm mol K SO S cm mol K Fe CN S cm mol

Report your answer as (solubility) x 510

Key: 2

214. The molar conductivity of aqueous solution of a weak acid HA is 200 S cm2 mol-1 and

its PH is 4. What is the value of pka of HA at 250C?

(Given: 0m (NaA) = 100 S cm2 mol-1 , 0

m (HCl) = 425 S cm2 mol-1, 0m (NaCl) = 125 S cm2

mol-1)

Key: 4

215. 0m (weak monobasic acid , HA) = 390.7 Scm2mol-1 . m of HA at 0.01 M = 3.907

Scm2mol-1 . Find PH of 0.01M HA.

Key: 4

216. Molar conductance of electrolytes varies with C generally as (I) or (II) as shown.

I

II

Mol

a r c

ondu

ctan

ce

C Among the following the number of species having similar graph as (II) is

COOH NH2

CH3COOH, KCl, HCl,

AgNO3, CH3COONa, Na2HPO3, H3PO4,

COO Na

Key: 4

217. In the given reaction , the number of isomeric products formed is-

CH3CHClCOOH + CH 3CHDOH H+

Ester(Racemic mixture) (optically pure

d-isomer) Key: 2

218. The number of compounds which liberates 2CO from 3NaHCO in the following is

OH

COOH CH3 COOH

COOCH3

NO2

NO2

SO3H

COOH

OH

OH

CH3 CH3

CH3

OH

O2N NO2

NO2

COOH

Cl Key: 6

219. The number of moles of 4LiAlH required to reduce 4 mol of RCOOH to 2RCH OH is

Key: 3

220. Total number of β- keto monocarboxylic acids (including stereoisomers) which on

heating give the following compound. O

CH3

Key: 6

221. Maximum number of moles of RMgX that reacts with one mole of following

compound COOH

O

O

CH3

ClOC

N

Key: 6

222. How many of the given compounds are monosaccharides.

Glucose Mannose Fructose Galactose Lactose Starch

(I) (II) (III) (IV) (V) (VI)

Cellulose Sucrose Maltose

(VII) (VIII) (IX)

Key: 4

223. How many of the given compounds are naturally occurring amino acids.

Alanine Valine Leucine Proline Methionine Tryptophan

(I) (II) (III) (IV) (V) (VI)

Glycine Serine Cysteine

(VII) (VIII) (IX)

Key: 9

224. How many of the compound form same osazone on treatment with Phenyl hydrazine.

Glucose Fructose Mannose Sucrose Starch Cellulose

(I) (II) (III) (IV) (V) (VI)

Lactose Maltose Galactose

(VII) (VIII) (IX)

Key: 3

225. A decapeptide (Mol. Wt. 796) on complete hydrolysis gives glycine

(Mol. Wt. 75), alanine and phenylalanine. Glycine contributes 47.0% to the total

weight of the hydrolysed products. The number of glycine units present in the

decapeptide is

Key: 6

226. How many of the given sugars are reducing sugar.

Key: 6

227. How many of the following metals can be purified by Electrolytic refining as well as

distillation process?

, , , , , , , ,Al Cu Ag Au Zn Hg Cr Pb Sn Key: 1

228. The number of oxides that can be reduced by carbon to give respective metals is 2 2 2 3 2 3 4, , , , , , ,Cu O SnO Fe O ZnO K O CaO PbO Fe O Key: 6

229. An Acidic impurity is removed from the gaseous emissions of coal fired power

stations by passing them through an aqueous suspension of mineral followed by

oxidation. Select the number of incorrect combination for these conditions

Acidic impurity Mineral Oxidized product / final product

1) 2SiO CaO 3CaSiO

2) 2SO 3CaCO 4CaSO

3) 4 6P O 2Ca OH 3 4 2

Ca PO

4) 3SO 3MgCO 4MgSO Key: 3

230. The No. of sulphide ores in the following is Cassiterite, Galena, Zinc blende, Azurite,

Siderite, Silver glance.

Key: 3

231. From the following , , , ,Ag Zn Sn Au Cu , number of metals present in anode mud of

refining of crude copper, are _ _

Key: 2

232. Of the following reduction process, number of the correct process are

i) 2 3Fe O C Fe ii) 3 4 2Ca PO C P

iii) ZnO C Zn iv) PbO C Pb

v) 3 WO C W Key: 4

233. Two important ores of metals are given below

Malachite 3 24. .CuCO Cu OH xH O

Carnallite 2 2. .KCl MgCl yH O

What is y – x?

Key: 6

234. How many statements are correct?

1) 6 2 6 PbSiF H SiF gelatine is taken as electrolyte in refining of lead

2) Ores are generally converted into oxide prior to reduction

3) In the extraction of Ag, 2Na Ag CN is reacted with Zn

4) In froth flotation process Na ethyl Xanthate is used as collector

5) Cu can be extracted by the reduction of CuSO4 with scrap iron in hydrometallurgy

6) Nitriding is a process of heating steel in presence of 2N or NH3 to form iron nitrides

Key: 6

235. Find the number of ions which are coloured in water?

4 3 2 2 2Ti ,Ti ,Co , Zn ,Fe

Key: 3

236. How many of the following orders are given correct?

1) Zn < Cu – Melting point

2) Cr < W – tendancy to form metal-metal bond

3) 3 3CrO WO - oxidizing power

4) Mn < Fe – Enthalpy of atomization

Key: 3

237. How many of the following metals can be extracted by carbon reduction (either from

chief ore or from low grade ores)?

Copper, Lead, Tin, Zinc, Iron, Silver, Aluminum, Molybdenum.

Key: 5

238. The spin only magnetic moment of transition metal ion found to be 5.92 BM. The

number of unpaired electrons present in the species is :

Key: 5

239. The oxidation state exhibited by the transition metal which is present in Ziegler-Natta

catalyst is _______

Key: 4

240. The number of transition metals in bronze is ' 'x , and in brass is ' 'y then x y is :

Key: 2

241. How many of the following compounds are diamagnetic? 2 4 2 2 4 2 3 2 4 2 5 2 7 2, , , , , .5 , , , ,K MnO HgI K CrO Cr O Ag O CuSO H O AgF CrO Mn O MnO Key: 6

242. How many complexes among the following are paramagnetic

3 3 326 6 3

236 26

2 33 32 42 4

, , ,

, , ,

, , .

Mn CN Cr H O Co en

V CO Ni NH Ni dmg

Pt Cl NH Cu NH Cu CN

Key: 5

243. How many complexes are less stable than 3

6Fe CN

32 3 3

3 3 246 6 6, , ,Co NH Fe NH Fe H OCu CN

Key: 4

244. The change in the number of unpaired electrons when 32 6[ ( ) ]Fe H O is changed into

36[ ( ) ]Fe CN is

Key: 4

245. NOCOx y zM CO NO M NO

Where EAN of metal M in both product and reactant is same and it is 54. Then

calculate value of x y z . (where x, y and z are natural numbers and M belong to 6th

group according to long form a periodic table).

Key: 1

246. No of incorrect statements are-

A) The bond between metal and carbonyl carbon reduces the bond order

of C – O in carbon monoxide

B) dz2 orbital of central metal atom / ion is used in dsp2 hybridisation.

C) CN is a -acid Ligand.

D) All negative ligands are stronger than neutral ligands.

Key: 2

247. Sum of optically active isomers of P, Q, and R are

P) 3 3Ma b Q) 2 2 2Ma b c R) 22M cAB

a, b and c are monodentate ligands while AB is unsymmetric bidentate ligand.

Key: 8

248. How many of the following statements is/are correct?

(A) The order of splitting energy is 2 2 24 4 4PtCl PdCl NiCl

(B)[Ni(CO)4] is diamagnatic whereas [Ni(H2O)6]2+ is paramagnetic.

(C) 2 24[ ( ) ]Ni CN dsp hybridized and paramagnetic.

(D) The magnetic moment of K3[Fe(CN)6] is 3 B.M

Key: 3

249. How many statements is/are correct for given complex 3

2 4 3Co C O

i) It contain negative ligands only

ii) The oxidation state of central metal atom is +3

iii) It is optically active

iv) Due to chelation the stability of the complex increases

v) It exhibit geometrical isomerism

vi) It is octahedral with d2sp3 hybridization.

vii) If one oxalate ligand is replaced by glycinate ion then it form two enantiomeric

pairs

Key: 5

250. The wave number of the radiation absorbed by 4

6CoCl is 18000 cm-1, then the

wave number of the radiation absorbed by 2

4CoCl is 3 110k cm . Then the value

of k is

Key: 8

251. Number of the following statements is/are correct?

(A) Greater the stability constant of a complex ion, greater is its stability

(B) Greater the oxidation state of the central metal ion, greater is the stability of the

complex

(C) CO stabilizes complex because of its synergic Bonding.

(D) Chelate complexes have low stability constants

Key: 3

252. Oxidation state of Cr in chromyl chloride is

Key: 6

253. How many of the following are yellow solids insoluble in water

2 3 4 3 2 2, , , , , , ,AgCl PbBr BaCO PbCrO AgNO CdS AgI Hg I

Key: 3

254. Total number of ‘d’ electrons present in the iron of brown ring complex is

Key: 7

255. The change in the oxidation state of iodine when excess of chlorine water is added to

an iodide salt is

Key: 6

256. How many number of statements given bellow are correct

1) Sulphate ion gives white precipitate with lead ion (Pb2+) soluble in ammonium

acetate due to formation of 34 42Pb CH COONH

2) 2PbCl insoluble in cold water but soluble in hot water

3) When 3AgNO reacts with 2NO white crystalline ppt is formed

4) AgI insoluble in 3NH aq solution

5) Ba gives yellow green colour to flame test

6) 2 3Ag CO upon heating produce melallic silver

7) Oxidation state of iron change from +2 to +3 in methylene blue test

8) Lead acetate insoluble in water

Key: 6

257. Among the following, the number of compounds that can react with 5PCl to give

3POCl is 2 2 2 2 2 4 4 10, , , , ,O CO SO H O H SO P O Key: 4

258. When titrated against a base a polyphosphoric acid gave end points at 30.4mL and

45.6 mL. Calculate the number of phosphorus atoms in the polyphosphoric acid.

Key: 4

259. How many of the species are paramagnetic? 2 2 2 2, , , , ,N O NO O NO NO CO

Key: 3

260. How many of the given chemicals liberates dinitrogen on heating

4 2 3 4 2 7 3 32 2 2, , , ,NH NO NaN NH Cr O Pb NO Ba N

Key: 4

261. How many species out of the following have reducing properties?

3 3 3 2 3 3 3 4 2 4 3 2, , , , , ,NH PH H PO H PO H PO N H Ca P Key: 6

262. In 5PCl , how many P Cl are inclined at 0120 with one each.

Key: 3

263. Number of chemical species having bond between nitrogen atoms

2 4 2 5 2 4 2 2 3 4 3, , , , ,N O N O N H N O N O asymetric NH NO

Key: 4

264. Number of metals that show passivity with conc. 3HNO among

, , , , , , ,Cr Fe Ni Cu Zn Al Ag Sn Key: 4

265. Find number of species which produce elemental sulphur when treated with 2H S : 3 2

2 2 2 3 3, , , , ,Fe Fe SO H O O HNO

Key: 5

266. How many of the following contain S-S linkage?

2 2 8 2 3 6 2 2 6 2 2 3, , , ,H S O H S O H S O H S O 2 2 7 ,H S O 2 2 4H S O Key: 4

267. How many S-O single bond linkages are present in peroxo disulphuric acid?

Key: 4

268. Number of molecules among the following having non-zero dipole moment is:

3 3 4 6 2 2 2 2, , , , , , ,O SO SF SF H S CS SO H O and 2 2H O Key: 6 269. Sum of total number of amphoteric and neutral oxides among the following is:

2 3 2 2, , , , , ,CO NO Cr O PbO PbO SnO ZnO Key: 7

270. How many of following statements are correct?

A) Engel’s sulphur contains 6S molecules

B) 2H S cannot be dried by using Conc 2 4H SO

C) 2H S on reaction with 2aq.SO can form colloidal sulphur

D) 2SO reacts with 2Cl in presence of charcoal to give 2 2SO Cl

E) 2SO acts as a bleaching agent in dry condition also.

F) Bleaching action of Ozone is due to it’s oxidizing action

Key: 5

271. The number of isomers possible for the molecular formula 6 10C H with terminal alkyne

group is (including stereo isomers)

KEY: 5

272. How many statements are true for the following pair of compounds?

C C

H H

Cis

C C

H

H

Trans (i) Dipolemoment of trans isomer is zero

(ii) Boiling point of cis isomer is more than trans isomer

(iii) Cis isomer is more stable than trans isomer

(iv) These are also called configurational diastereomers

(v) These are readily interconvertible under normal conditions

(vi) Melting point of trans isomer is more than cis isomer

(vii) Trans isomer is more soluble than cis isomer in polar solvents

KEY: 4

273. The number of geometrical isomers possible for the following compound is

CH2CH3

KEY: 8

274. obs i iX , where µi is the dipolemoment of stable conformers and Xi is the mole

fraction of those conformers of Z-CH2-CH2-Z. If µobs is 1Debye and molefraction of

antiform is 0.8, the dipolemoment of Gauche form is?

KEY: 5

27 5. Identify number of compounds that can show geometrical isomerism.

KEY: 4

276.

Value of “X” is……

KEY:5

277.

No of stereoisomers possible for unsaturated compound is (including the

product)……

KEY:4

278. In how many reactions, product is formed through cyclic transition state?

CH2

CH3

CH3

CH3

H B

CH3

CH3

CH3CH3

solvent"X" no of primary alcohols

excess H2O2

OH-

CH3 Et

1 eq. cold.dil.alk.KMnO4

Unsaturated compound .

CH2 CH21.Hg(OAc)2,H2O

2.NaBH4

CH3COOHB(CH2CH3)3

KEY:7

279.

Alkyne(C6H10)HgSO4

H2SO4

only one ketone

No of structural alkynes possible for alkyne which can satisfy the above reaction is…

KEY:5

280. Napthalene has three canonical kekule structures. Assume that each structure is

subjected to reductive ozonolysis.

Maximum no of atoms that can lie on a plane for molecule “A” is “X”.

Maximum no of atoms that can lie on a plane for molecule “C” is “Y”.

Then |X-Y| value is…

KEY:2

281. Nitrogen bases are given below.

CH2 CH2Br2

CH2Cl2

CH2 CH2NBSH2O

CH2 CH2O3

CH2Cl2

CH2 CH2NeutralKMnO4

CH2 CH2

CO3H

Cl

Most stable canonical form reductive ozonolysis A + B (mol.wt: A > B)

Least stable canonical form reductive ozonolysis C + D (mol.wt: C > D)

No of electrons in the most basic compound is….

KEY:6

282.

Then |X-Y| value is…

KEY:5

283. How many of the following intermediates have at least one contributing structure in

which all atoms have their octet complete?

O

NCH3CH3

O

OCH3

NO2

, , , , ,

KEY:5

284.

CH3

CH3

1 eqHBr Product.

No of allylic hydrogens in thermodynamic product is “X”

No of vinylic hydrogens atom in kinetic product is “Y”

The value of |X-Y| is….

NH

NH

N N

NH2

CH3 NH2

ONCH3

N

NH

O

O

CH3CH3

Non aromatic compound.

Excess of H2/Pd Cl2hν

"X" no of mono chloro Fractional distillationproducts "Y" fractions

KEY: 5

285. No of stereoisomers possible for the following compound is

Br

Br Cl KEY:4

286. No of carbon atoms in the principal carbon chain of the following compound is

(Consider IUPAC name)…

CH3

OH

O H

CH2

OH KEY:5

287. The value of “X” in the following reaction is…..

1.NaH2.CH3COOD

*

*" X " no of deutarated produt(s)

* indicates isotopic carbon atom KEY:3

288. How many of the following molecules will give 2,3,5-trimethylhexane on heating

with sodalime?

CH3

CH3 CH3

CH3HOOC CH3

CH3

COOHCH3

CH3 CH3

CH3

CH3 CH3

COOHCH3

CH3

CH3

CH3 CH3

CH3

COOH

CH3

CH3

CH3 CH3

CH3COOH

CH3

CH3

CH3

CH3

HOOC KEY:5

289. In the following reaction, consider the most stable conformer of final product. This

conformer has only one plane of symmetry. No of atoms lie on that plane is….

Cl

Cl

Naether

H+,Δproduct(non polar molecule)

KEY:6

290. Locant of halogen ((Consider IUPAC name)) in the final product is……

CH CH CuCl

NH4Cl2 1 eq

HClMe2CuLi 1 eq.HBr Major product

KEY:1

291. No of meso products formed in the following reaction is…

CH3CH3

CH3 CH3

Excess of Br2

CCl4possible tetrabromoproducts

KEY:0

292. How many out of the following compound (s) can not contain benzene ring?

10 16C H , 8 6 2C H Cl , 5 4C H , 10 15C H N

KEY:2 293. How many structure(s) out of the following are aromatic:-

O

BH

NH O

, , , , ,

KEY: 5

294.

Me

Et Br

alc.KOHΔ

9 16

Elimination product(s)C H

How many product(s) will be formed?

KEY:4

295. How many out of the given statement(s) is (are) correct-

i) Phenyl group is known to exert negative inductive effect, but each phenyl ring in

biphenyl 6 5 6 5C H - C H is more reactive than benzene towards electrophilic

substitution.

ii) 7-bromo-1,3,5-cycloheptatriene is ionic compound whereas 5-Bromo-1,

3-cyclopentadiene can’t ionise even in the presence of Ag

iii) CH3

BrCH3

2 5C H OH(aq) acidicsolution

iv)

NaOH(aq) F liberated

F

CH3

O2N

v)

NaOH(aq) F is not liberated

F

CH2NO2

CH3

KEY:5

296. Find the total number of feasible products (including stereoisomers) in the following

reaction. (No carbocation rearrangement is observed)

4

HBrCCl

KEY:4

297. Find the total number of monobromo products obtained during the reaction-

CH

CH3

CH2

NBSh

KEY:4

298. Find the total number of optically active products obtained in the following reaction-

Me

D

CH.D.Cl

H 2

NaEt O

KEY:3

299. The total number of resolvable and non-resolvable racemic mixtures (pairs) possible

with molecular formula 4 11C H N KEY:3 300. X is the number of structural isomers which gives isocyanide test (consider all

primary amines) and Y, which do not give isocyanide test with M.F - 8 11C H N (All are

benzene derivatives) Then X-Y (difference) is

KEY:8

301. In how many of the given compound nitrogen atom may be removed as trimethyl

amine by repeated Hofmann eliminations (exhaustive methylation followed by heating

with AgOH )?

A) N B)

N3CH

C)

3 2( )N CH

D)

N3CH

KEY:4

302. The number of moles of electrons involved in the reduction of one mole of

nitrobenzene by Sn-HCl is

KEY: 6

303. How many moles of HI can react with 1 mol of the following compound?

CH2

OCH3

OH KEY:2

304. The total number of aldehyde & ketone isomers possible for C5H10O are_____

KEY:8

305. The total number of enols possible for the formula C4H8O are ___

KEY:6 306. A carbonyl compound of formula C9H10O(A), which is a benzene derivative gives

orange precipitate with 2,4 -D.N.P and also gives yellow precipitate with I2 in

presence of aqueous NaOH. The total no. of isomers possible for ‘A’ are______

KEY:3

307. In how many of the following reactions aldehyde is formed as product?

i) O

O-78ºCDIBALH ,

ii) OH

300ºCCu ,

iii)

OH

ii)i) 3 /CHCl KOH

3H O

iv)

3 3, /H C COCl AlCl

v)

3CH

2, ,CO HCl ZnCl

vi)

3CHOC

O

3 2, ,AlCl CS

vii) OH

2 2PDC,CH Cl

Viii) OH

3 2,CrO AC O

KEY:6

308.

H

O

HCN m 2HCl H O n

(No.oforganic products)

(No.oforganic products)

m+ n is_____

KEY: 4

309. Find the number of compounds which on reaction with 4LiAlH followed by treatment

with water give optically inactive compound?

I

O O

CH3

II CH3

CN

III

O

O

IV

OCH3

CH3

O

V

O O

CH3

O

VI

Cl H

O

CH3

O

KEY: 5

310. How many of the following are classified as LINEAR polymers?

LDPE, PVC, amylopectin, cellulose, melamine, nylon 6, isoprene and polystyrene

KEY:4

311. How many of the following undergo Hoffmann bromamide rearrangement?

Benzamide, DMF, Aniline, N-methyl ethanamide

KEY:1

312. Identify the no of pairs which are correctly matched?

Polymer Molecular formula/ representation of repeating unit

Nylon 6 2 5[ ( ) ]CO CH NH

PET/Terylene 10 8 4[ ] C H O

PVC 2 3[ ] C H Cl

Neoprene 2 2[ ( ) ]CH C Cl CHCH

KEY:4

313. How many of the following amino acids when fused with sodium followed by

addition of aq. sodium nitroprusside give purple colour solution?

Arginine, Lysine, Serine, Aspargine, isoleucine, Tyrosine

KEY:0

314. A decapeptide of molecular weight 796g/mol on hydrolysis gives glycine, alanine and

phenyl alanine, of which glycine contributes 47% of the hydrolysed products by

weight. What is the number of alanines in the decapeptide?

KEY:2

315.

CH3 COOH ANaCN

BH3O

+

C

red P / Cl2

(C7H7O2N)

If the difference in molecular weights of reactant and final product is X, then X/4=?

KEY:0

316.

CH3COOEt

O

EtO-/EtOH

OA

HBr

Bromo ketone

5 9(C H OBr)

What is the sum of locants in IUPAC system of naming for the final product formed?

KEY:7

317. How many reactions occur as shown in the forward direction under appropriate

conditions?

(I) O

OHH

HH

OHOH

H OH

H

OH

CH3I (excess)

Ag2O

O

OMeH

HH

MeOOMe

H OMe

H

OMe

(II) CH3 COOH

NH2

CH3

Ac2OCH3

COOH

NHCOCH3

CH3 (III)

CH3

D

H OH + Cl

O

NO2NO2

COO CH3

D

H

(IV) OH

COOH

Ac2OAspirin

KEY:3

318. How many of the following statement(s) are correct?

(i) 5 moles of Formic acid decolourises 2 moles of acidified solution of 4KMnO

completely

(II) amino acid and hydroxy acid behave in a similar way when heated

(III) When 2 moles of potassium acetate is electrolysed 1 mole of gaseous products is

obtained at cathode under ideal conditions assuming 100% efficiency and no side

reactions

(IV) Glucose pent acetate doesn’t form 2,4-DNP derivative

(V) D-glucose reacts with 2NH OH.HCl to form a diastereomeric pair of glucose

oximes

KEY:5

319. Isothermal compressibility of an ideal gas is defined as ,

1

T n

dvkv dp

what is

isothermal compressibility for an ideal gas at 1.0atm.

KEY:1

320. Certain amount of gas confined in a piston-filled cylinder is heated from 027 C to 0127 C keeping its pressure constant and gas expanded against constant pressure

doing 4.157kJ of work on surroundings find the number of moles of gas present in

cylinder.

KEY:5

321. Number of extensive physical properties is

density, viscosity, emf of drycell, surface tension, molarity, dipolemoment, molar heat

capacity, refractive index, vapour pressure, molar entropy change.

KEY:0

322. If 0 ,fH MgCl s is -125 KJ/mole, 02,fH MgCl s is -642 KJ/mole the enthalpy of

disproportionation of MgCl is -49X to form one mole each of 2MgCl and other

feasible product. When X is ____

KEY:8

323. At constant volume of 0.0821 litres for an ideal gas if 300d PTdT

at 150K. The

number of moles of that gas is____

KEY:1

324. 50ml of a liquid (vapour pressure 8cm at 300K) having density 2.2g/ml is placed in a

container of 4 litres at 300K. It is connected to another empty container of 4 litres at

300K. The resultant pressure inside the vessel at same temperature in cm is______

KEY:8

325. Number of correct statements of the following

A) The gas on subjecting to joule Thomson effect gets heated if its temperature is less

than its inversion temperature

B) At equilibrium, where properties of a system no longer change, the entropy of

system will be zero.

C) Gaseous molecular suffer no energy loss due to friction

D) Speed distribution of 2O at Tk is same as for 2SO at 2Tk

E) Energy can be transferred between gaseous molecules during collisions but RMS

velocity remains constant at given temperature

F) The compressibility factor for 2N at 050 C and 800atm pressure is 1.95. The

moles of 2N required to fill up a balloon of 100litres capacity is 32.24 10 .

G) If is mean free path then T at constant P and 1p

at constant T for ideal

gases

H) Mean free path varies inversely with the number of molecules per unit volume of

gas.

I) A gas described by vander waal’s equation behaves similar to an ideal gas in the

limit of larger molar volumes.

J) Increase of pressure decrease melting point of solids showing compression on

fusion and increase the melting point of solids showing expansion of fusion.

KEY:8

326. Equimolar mixture of two gasesX2 and Y2 is taken in a rigid vessel at temperature 300

K. The gases reacts according to given equations

12 2 PX X Kg g

22 2 PY Y Kg g

32 2 2 2PX Y XY Kg g

If the initial pressure in the container was 2 atm and final pressure developed at

equilibriums 2.75 atm in which equilibrium partial pressure of gas AB was 0.5 atm,

calculate the ratio of 2

1

P

P

KK

?

KEY:8

327. Compound C is a gas at room temperature, but not stable and decomposes to yield the

gases I and J:

g g gC I J Kc = 3.203

Compound J dimerises to give gas M:

2 g gJ M Kc = 6.807

One mol of compound C were evaporated in a flask with a volume of 1L at room

temperature. After establishing the equilibrium, 0.3530 mol of substance M were

generated. % of the original compound C are present in this equilibrium is X/3. Value

of x/3 adjusted to nearest integer is

KEY:2

328. What is ratio of moles of 2Mg OH to 3

Al OH in 1 litre of their saturated solution (

SPK of –122

Mg OH 4 10 and SPK of –333

Al OH 1 10 ) Give answer by multiplying

the ratio with –1710 .

KEY:8

329. How many gm of solid NaOH must be added to 100 ml of a buffer solution which is

0.1 M each with respect to acid HA and salt NaA to make the pH of solution 5.5.

Given 5akp HA (Use antilog (0.5) = 3.16)? Adjust your answer to nearest integer

and report your answer after multiplying with 10.

KEY:2

330. Calculate the percent error in the [H3O+] concentration made by neglecting the

ionization of water in 10-6 M NaOH solution.

KEY:1

331. Silver is electrodeposited on metallic vessel of total surface area 2500cm by passing a

current of 0.5 amp for two hours the thickness of silver deposited is qP 10 cm (in

scientific notation).

[Given: Density of silver = 310.5g cm , Atomic mass of silver = 108 amu,

F = 96500 1Cmol ] Find the value of q?

KEY:4

332. Resistance of a conductivity cell filled with 0.1 M KCl solution is 100 ohm. If the

resistance of the same cell when filled with 0.02M KCl is 520 ohm. The molar

conductivity of 0.02 M KCl solution is 4 2 1P 10 Sm mol . Given conductivity of 0.1 M

KCl solution is 11.30Sm . Find the value of P before the decimal point?

KEY:1

333. Number of moles of 4KMnO required to oxidise 10 moles of 2 4Fe C O in acidic

medium is ‘q’.. Suppose molecular weight of 2 3As S is ‘M’ and the equivalent weight

of 2 3As S in the reaction 3 22 3 3 2 4 4As S H NO NO H O AsO SO is

14M

p.

Then q – p = ______

KEY:4

334. V ml of aq solution of 2 4KHC O . 2 2 4H C O . 22H O required 20 ml of M/20 2Ca OH

solution for neutralization. If same volume of given solution required x ml of M/15

4KMnO solution in acidic medium, find value of x?

KEY:8

335. The potential of Pt, Hg(l) | Hg(I) nitrate (0.01M)|| Hg(I) nitrate (0.1M)| Hg(l), Pt is 2y 10 V.(in scientific notation). Find the value of y to the nearest integer?

KEY:3

336. 10% sites of catalyst bed have been occupied by H2. On heating H2 gas is evolved

from sites and collected at 0.03atm and 300 K in a small vessel of 2.46 cm3. No. Of

sites available is 156.0 10 per cm2 and surface area is 1000 cm2. The number of

molecules of H2 adsorbed per site of catalyst is (Given 236 10AN )

KEY:3

337. 100 mL of 0.6M acetic acid is shaken with 2g activated carbon. The final

concentration of the solution after adsorption is 0.5M. What is the amount of acetic

acid adsorbed per gram of carbon? (Give your answer after multiplying with 10)

KEY:3

338. Consider the arrangement of circles of equal radii with their centres arranged as per

the 2-dimensional lattice defined by a = b, = 60° such that each circle is touching all

its nearest neighbours. If all the void areas present are additionally occupied by

smaller circles of relevant size so that the void circles are just contacting their

neighbours. Find the packing efficiency of the configuration in percent. (Give your

answer as 100 – value)

KEY:5

339. An ionic solid 2AB isomorphous to the rutile structure (a tetragonal system with

effective number of formula units =2) has edge lengths of the unit cell are 0 0 04 ,4 5A A and A . Calculate the density (in mg/cc) of the substance if its formula

weight is 81. Take 236 10AN and the answer is 4000 -5n. Give the value of n.

KEY:4

340. Ionic solid B A crystallizes in rock salt type of structure. 1.296 gm ionic solid salt

B A is dissolved in water to make one litre solution. The pH of the solution is

measured to be 6.0. If the value of face diagonal in the unit cell of B A is 600 2 pm.

calculate the density of ionic solid in gm/cc.

5 23298 10 6.0 10bT K K for BOH is Avogadro Number KEY:4

341. White phosphorus disproportionate in concentrated NaOH and gives PH3 and

NaH2PO2. The sum of stiochiometric coefficients of reactants in the balanced red-ox

reactions is _________

KEY:7

342. The minimum number of moles of potassium chlorate required to decompose to give

sufficient oxygen for complete combustion of 22.4l of C2H4 at STP are_____

KEY:2

343. The velocity of electron in one of the Bohr orbits of hydrogen atoms is 0.55 × 106 m/s:

The orbit number is _______

KEY:4

344. The potential with which an electron is accelerated to possess a wavelength of 6.13Aº

is _____ volts.

KEY:4

345. Maximum number of electrons present in a p-orbital are _______

KEY:2

346. Find the number of correct statements about azeotropic mixture

1. When a sizeable deviation from ideality occurs, the boiling point curve for a binary

mixture may exhibit a maximum or minimum.

2. Mixtures having maximum or minimum boiling point are known as azeotropic

mixture.

3. These mixture distil without change in composition

4. It follows that, at a given pressure, the maximum separation that can be achieved by

fractional distillation is to azeotropic mixture and one of the pure component.

5. The azeotropic composition may vary significantly with applied pressure.

KEY:5

347. A man weighing 80 kg was injected with 5 ml of water containing tritium showing

activity of 111.08 10 dpm . After 5 minutes when the sample is distributed uniformly

within the body water of patient, a 1.0 ml sample of body water showed an activity of 43.0 10 dps . Estimate the weight percentage of water in the human body. Neglect any

change in volume of water in the human body during the observation period and take

the density of water as 31000kg / m . (Half life 31H is 12.3 years). Suppose your answer

is xy% then represent it as x – y.

KEY:2

348. Equal mass of A & B present in liquid solution then total pressure exerted by vapours

is X torr. Give X/6. [A = 80 gm/mol, B = 120 gm/mol]

KEY:6

349. In a sample of sodium, ratio of it’s isotopes of 24 23Na & Na is 101.8 10 :1 . If 69 gm of

such sample is taken and found to have activity of 54 Rd. then half life of radioisotope 24Na (in minutes) is. (Take: 23

AN 6 10 , ln 2 0.7 ). Represent the answer in scientific

notation at yx 10 and find the value of x-y.

KEY:3

350. A 3.42% w/v solution of cane sugar has undergone partial inversion according to

following equation 12 22 11 2 6 12 6 6 12 6C H O H O C H O C H OGlucose Fructose

If osmotic pressure of solution is atm at 300 K temperature after 400 min, then

calculate the value of 2.1

Given: Angle of rotation 20 50 80

Time (min). 100 300

R = 1 10.08atm litre mol K

KEY:2

351. How many of the following is correct regarding bond angle?

(i) 3 3NH H O

(ii) 2 2F O H O (iii) 2 2SCl OCl (iv) 2 2H S H O

(v) 2 2NO NO (vi)

3 3C H CH

(vii) 3 4NH CH (viii)

4 3B F BF

KEY:8

352. How many orders are correct match?

(i) Boiling point: PH3< AsH3< NH3< SbH3

(ii) Dipole moment: CH3F > CH3Cl > CH3Br

(iii)Bond angle: OF2<H2O < OCl2

(iv)Solubility: BeSO4> MgSO4> CaSO4> SrSO4> BaSO4

KEY:3

353. The ratio of lone pairs between 4AlCl and 2CO is

KEY:3

354. Out of 3 2 2I , ICl ,BeCl , 52 6XeF ,XeF ,BrF ,HC CH .How many will have linear shape?

KEY:5

355. Amongst the following the total number of the compounds i.e oxide soluble in

aqueous NaOH is 2 3, , , , , , ,Al O ZnO SnO PbO CuO BeO BaO CaO

KEY:5

356. How many of the following metal chlorides impart characteristic colour to the

oxidizing flame? 2 2 2 2 2, , , , , , , ,LiCl NaCl KCl RbCl BeCl MgCl CaCl SrCl BaCl

KEY:7

357. How many of the following nitrates of metal ‘M’ decompose on heating similar to as

given below in the scheme? (where; , , , , , , , ,M Li Be Mg K Ca Sr Na Rb Ba )Metal nitrate heatmetal oxide + nitrogen dioxide +oxygen gas

KEY:6

358. The decahydrate form of sodium carbonate i.e., washing soda on standing in air

effloresces to powder. The number of water molecule (s) present in the compound

formed is

KEY:1

359. 2X ions adopt the following arrangement in which only tetrahedral voids are occupied

by the ions of a metal “M”

If 0.01 moles of the smallest repeating units of the above arrangement are present in

“800 ml” aqueous solution, the reduction potential of the metallic electrode is 0.44 V

(S.R.P of metal electrode = 0.5 V) 1 Find the number of tetrahedral voids

occupied by metal ions in that arrangement

KEY:8

360. An equimolar solid mixture of 3 3,AlCl FeCl and 3CrCl is washed with a buffer solution

of pH = 8. After precipitates are removed the maximum possible ratio of any two

trivalent ion concentrations in the solution is 10yx . What is y x ?

34 39 313 3 3

values : Al 2 10 , 4 10 , 2 10sp OH Fe OH Cr OHK

KEY:2

361. H2S is passed through an aqueous solution containing Cu2+, Cd2+, Hg2+, Ba2+, Al3+,

Mg2+, Zn2+, Ni2+, Mn2+, Co2+ and Bi3+ in presence of dil. HCl. The number of ions

which are precipitated as sulphides is

KEY:4

362. The total number of isomers expected for 2

2 2Pt NCS en

is ……

KEY:9

363. Among 2 3 2 3 6 4, , , , ,H S PH H O NH SF XeF , the number of compounds which have bond

angle nearly 90 is

KEY:4

364. Among the following, the number of compounds, which can participate as ‘diene’

component in a Diels-Alder reaction is __.

KEY:6

365. The number of reducing sugars among the following is

KEY:3

366.

O

NH

O

How many of the following reagent(s) used for the above synthetic transformation

I) a) 2 / ,NH OH H b) 2 4H SO

II) 3 /HN H

III) a) 2 / ,NH OH H b) NaOH

KEY:2 367. Total number of possible isomers for the complex having empirical formula

3 2.6CrCl H O KEY:4

368. The number of sigma bonds in Ziese’s salt is

KEY:8

369. For how many of the following the weight increases in the applied magnetic field.

2 2 4 2 4 4 4 46, , , ( ], , , , , NO NO O K Fe CN KO MnSO NiSO CuSO ZnSO

KEY:8

370. FeSO4 reacts with excess KCN solution to form a complex then the no. of unpaired d-

electrons present in the central atom of that complex is

KEY:0

371. In how many of the following compounds the experimental lattice energies or

hydration energies will be more than the calculated lattice energies or hydration

energies

2 2 2 2 2 2 2 3 2 3 2, , , , .6 , .6 , .6 , .6NaCl FeF NiF CuF MnCl H O ZnCl H O FeCl H O TiCl H O

KEY:4

372. The magnetic moment of the complex compound 2 6 6Fe H O Fe CN in which iron

atom in both cation and anion is in same oxidation state is

KEY:7

373. The number of chloride ions coordinated to Fe3+ ion in anhydrous iron (III) chloride.

KEY:6

374. How many of the following compounds can be recovered by evaporation from their

aqueous solutions 2 2 2 4 3 4, , , , , , ,NaCl BeCl MgCl CaCl CuSO FeCl SnCl AgCl

KEY:4

375. In how many of the following reactions, reagents are wrongly chosen?

i)

25ºHBr

C

Br ii)

3

2 2

) /) /i BH THF

ii H O O H

OH iii)

2

2 4

H OH SO cat

OH

(only product)

iv)

2MnO

HO O

v)

3Al O tA

O

H

O

O vi)

3

2

))i O

ii H O +O

H

O vii)

2

4

HPd BaSO

H H

viii3Na in liquid NH

MeOH

H H

ix)

3

3

) /)i BD THF

ii CH COOH

D

KEY:5

376. A reaction takes 10 min for 10% completion at 27ºC . The time taken for the reaction

for 10% completion at 47ºC is nearly ___ min

1 1 23.03 . / 2 activationE K cal mole R cal K mol

KEY:1

377.

Cl

KOH alcohol m

(no.of organic prodcuts)

2

4

Br excessCCl n

(no.of organic prodcuts)2E

m+n value is _______

KEY:8

378. The potential of the cell

0.1

0.2

M BCl

M BOH

2Cu

2,pt H 1M 1atm

Cu

is 0.88 V at 25º C . BOH is a weak base & 2

0|Cu Cu

E is 0.34 V. If 20 ml of 0.1M BOH is

titrated with 0.1M HCl, the pH at equivalence point is_____

KEY:5

379. The RMS velocity at 1T K and most probable velocity at 42 4 7.9 10 /T K of CH is cm s .

If T2 is 210x K , what is the value of ‘x’?

KEY:6

380. If heated in water, borazine hydrolyses slowly. The total number of moles of gaseous

products obtained by hydrolysis of one mole of borazine is:

KEY:9

381. How many of the following combinations results in liberation of hydrogen gas?

(i) Al, NaOH

(ii) Ga, NaOH

(iii) 2 6 2B H ,H O

(iv) 2 6 3B H , NH (1: 2) / 200 C

(v) Electrolysis of aqueous 3AlCl

KEY:5 382. The difference in coordination numbers of Al in crystalline 3AlCl and vapour 3AlCl

~ 200 C is:

KEY:2

383. Among the following hydroxides the number of white precipitates is:

2 2 2 3 2 2 2 3 2Zn OH , Cd OH , Mn OH , Al OH , Ni OH , Co OH , Pb OH , Fe OH , Cu OH KEY:5

384. A sodium salt (V) gives a brown coloured gas with dil HCl and forms a brown

coloured complex with ferrous sulphate and acetic acid. With how many of the

following reagents, the salt (V) produces a gaseous product?

(i) with 4KMnO in acidic medium

(ii) boiling with 4NH Cl

(iii) with urea in presence of dil HCl

(iv) with sulphamic acid in presence of dil HCl

KEY:3

385. The number of sulphide minerals in the following is

Cuprite, Sphalerite, Carnallite, Calamine, Pyrolusite

KEY:1

386. How many of the following reactions occur during calcination.

3 2CaCO CaO CO

2 3 2 2 3 2.2 2Al O H O Al O H O

3 4 2 33 8 4 9Mn O Al Al O Mn

2 22 3 2 2ZnS O ZnO SO

2 42ZnS O ZnSO

KEY:2

387. Among Zn, Cd, Cu, Sn, Ge, Pb, Au and Bi, no. of metals refined by liquation is

_____.

KEY:3

388. Howmany of the following metals are found in native state?

Ag, Pb, Fe, Pt, Mg, Au, Cu, Al, Zn

KEY:3

389.

6 21

2 ,mole

XeF H O A HF ‘A’ has ' 'x bonds, y bonds and z lone pairs on Xe

atom x y z is

KEY:7

390. During extraction of copper, Matte contains A + B, the oxidation state of the metals in

A and B are ' 'x and ' 'y . x y is

KEY:3

391. Among the following number of compounds that have zero dipole moment

1) 2XeF 2) 4XeF 3) 2 2XeO F

4) 3XeO 5) 4XeO 6) 4XeOF

7) 2KrF

KEY:4

392. When a compound of xenon and fluorine is completely hydrolysed, HF is formed as

one of the products and no paramagnetic gas is produced.

The number of fluorine atoms present in one mole of that xenon fluoride is:

KEY:6

393. How many d p bonds are there in XeO4?

KEY:4

394. What is the total number of lone pair of electrons present in Xe in XeF2?

KEY:3

395. What is value of n (the number of negative charges) on the cyclic anion 4 12nSi O

KEY:8

396. What is the number of moles of R Mg X (Grignard reagent) required in the

formation of one mole of smallest cyclic silicone.

KEY:6

397. In how many of the following reactions carbon monoxide is one of the product.

i) 4 2 46FeK H SOCN conc

ii) 2 2 4 2 4H C O H SO conc

iii) 2 4HCOOH H SO conc

iv) ZnO C

v) 2CO C

vi) 2H O C

vii) 2CaNCN H O

viii) 2 4H SO C

ix) 2 4red hotNa SO C

KEY:7

398. How many metals of the following liberate NO gas with 20 % dil 3HNO

, , , , , , , Cu Fe Sn Zn Hg Pb Ag Au

KEY:4

399. Find the number of oxoacids which on heating produces one of the product having

lowest oxidation state of underlined atom.

3 2 3 3 4 3 3 2

4 4 3 4 2 2 74 2

H PO H PO H PO H PO PbO

PbCl NH NO NH NO Cr ONH

KEY:4

400.

OH

H / Possible products(x) 2 4Br /CCl (y) productsThen, x y is

KEY:8

401. The electron in the first excited state 1n 2 of H-atom absorbs a photon and is

further excited to nth shell. The de-Broglie wavelength of the electron in this excited

state is 1340 pm. Find the value of n.

KEY:4

402. The number of moles of NaOH required to react with gaseous products of the

following reaction:

4

hot,acidicKMnO

KEY:8

403.

In above figure, the gas filled in this bulb is subjected for the combustion of 10 moles

of 4CH . Maximum number of moles of 2CO formed in this process is 2. The volume

of the bulb is "11.2 x" litre at 280K. Find the approximate integer value of x.1 1R 0.08lireatm mol K .Atmospheric pressure 1atm

KEY:4

404. The total number of lone pairs of electrons in nitrogen containing product obtained by

heating ammonium nitrate at about 250 C is:

KEY:4

405. 16 moles of 2H and 4 moles of 2N are sealed in one litre vessel. The vessel is heated at

constant temperature until the equilibrium 2 2 3N (g) 3H (g) 2NH (g) is established; it

is found that the pressure in the vessel has fallen to 9 th10

of its original value (P atms).

Now 'x' moles of an inert gas is added at constant volume to the equilibrium mixture

till the original pressure (P atms) is attained. The value of 'x' is?

KEY:2

406. An emission is 3Be in observed at 02.116A . In which orbit is it placed?

Key :4

407. All the four blocks and four types of elements are present in the period

Key :6

408. No. of possible ionisation potentials for carbon are

Key :6

409. Vander waal’s radius is 10 %x more than covalent radius. What is x

Key :4

410. An oil drop has 196.39 10 coulomb charge. The number of electrons in the oil drop

is

Key :4

411. Find the ratio of energy of a photon of 02000A wavelength radiation to that of 04000A radiation is.

Key :2

412. What is the total number of radial and angular nodes present in 5f orbital?

Key :4

413. The orbital angular momentum of 3p electron is 2hx

. Then the value of x is

Key :2

414. Principle quantum number of the shell to which the g – subshell first arise is

Key :5

415. In an atom, the total number of electrons having quantum numbers 14, 1n m and

12sm is

Key :6

416. The number of p d bonds in 4XeO is

Key :4

417. How many of the following compounds having odd number of electrons:

2 2 2 2 2 4 2 5 2, , , , , , , ,Cs O MgO Cl O ClO NO NO N O N O CaOCl

Key :3

418. Total number of covalent bonds between carbon and carbon atoms in 3 2C O molecule is

Key :4

419. The total number of lone – pairs of electrons in the following compound is

N N

H

H H

H

Key :2

420. The number of sigma bonds in tetra cyano ethylene is

Key :9

421. What is the total no of pairs of electrons at least three quantum numbers for Be____

Key :4

422. The sum of the number of lone pairs of electrons on each central atom in the following

species is 26 2 3 3, ,TeBr BrF SNF and XeF

Key :6

423. How many of the following species have bond order of 2.5

1) 2N 2) 2N 3) 2O 4) 2O 5) NO 6) CN

Key :5

424. How many of the following compounds violate octet rule

1) 5BrF 2) 6SF 3) 7IF 4) 4CH

5) 5PCl 6) 2BeCl

Key :5

425. How many of the following ions have the same magnetic moment

2 2 2 2, , ,Fe Mn Cr Ni

Key :2

426. If each hydrogen atom in the ground state, 1.0 mol of H atoms are excited by absorbing

photons of energy 8.4eV,12.09eV,and 15.0eV of energy, then the number of spectral

lines emitted is equal to.

Key :3

427. The velocity of electron in certain Bohr’s orbit of hydrogen atom bears in the ratio

1:275 to the velocity of light. The quantum number (n) of orbit is nearly

Key :2

428. The wave length of a line in Balmer series of hydrogen atom is 4814 0A .From which

orbit de-exitation takes place nearly

Key :4

429. The deBroglie wave length of an electron in a certain orbit of hydrogen atom 13.3 0A

.So the no. of waves present in an orbit is

Key :4

430. If uncertainties in measurement of position and momentum of an electron are equal,

then the uncertainty in measurement of its velocity is 1210x .The value of x[the

closest whole number value] is 319.1 10 ,em kg and h=6.625 3410 Js.

Key :8

431. Number of ionization potential for uninegative oxide ion.

Key :9

432. Among the following has many are amphoteric metal oxides.

2 3 2 3 2 2, 2, 1 , , , ,CO A O As O SnO PbO GeO PbO

Key :3

433. Among the following in which process energy is released.

a) N g e N g b) Be g e Be g

c) O g e O g d) Mg g Mg g e

e) O g O g e f) Oh g e O g

g) H g H g e h) 2O g e O g

i) 2Mg g Mg e j) P g e P g

Key :4

434. First the elements in the first short period of modern periodic table, maximum

possible oxidation state with respect to oxygen is _______________ .

First and second ionisation energies of an element M are 600KJ/mole and 1600

KJ/more respectively. If 1000 KJ of energy is supplied to one mole of vapours of ‘M’.

Then in the resulting mixture mole percentage of 2M is 5x . Then the value of x is

Key :5

435. How many elements in the periodic table are lack of neutron (i.e., without neutron)?

Key :1

436. Among the following, what is the total number of compounds having +3 oxidation

sate of the underlined elements?

a) 4 2 7_

K P O b) 4___Na AuCl c) 4 10 28

___Rb Na H V O

d) __I Cl

e) 6___Ba XeO f) 2__

O F g) 2___ 2Ca Cl O h) 2___

N O

Key :3

437. CN ion is oxidised by a powerful oxidizing agent to 3NO and 2CO or 23CO

depending on the acidity of the reaction mixture.

2 3CN CO NO H ne

What is the number n of electrons involved in the process, divided by 10?

Key :3

438. In the following reaction

3 3 2 4 32xZn yHNO dil aZn NO bH O cNH NO . What is the sum of the

coefficients ?a b c

Key :3

439. What is the sum of protons, electrons and neutrons in the heaviest isotope of

hydrogen?

Key :4

440. How many moles of phosphines are produced when one of the calcium phosphines

reacts with water

Key :2

441. The average speed of ' 'He is _ times of 2SO at same temperature

Key :4

442. RMS speed of a gas is 15 .ms If some molecules out of 10 molecules in all, are

moving with 17ms and rest of all the molecules are moving with 13 .ms The number

of molecules moving with higher speed is ____

Key :4

443. rmsU of 4CH at ‘T’ K is 6 times of mpU of 2SO at 1 .T K The temperature of 4CH gas is

____ times of 2SO

Key :6

444. The organic compound containing phosphorous is heated with an 2 2.Na O The

phosphorous is oxidized to " "x major compound. Oxidation state of phosphorous is

the ' 'x is

Key :5

445. Out of the given below, how many of the following are used for purification of

organic compounds. Sublimation, crystallization, distillation, differential extraction

chromatography

Key :5

446. How many number of compounds are green house gases in the following

2 2 4 3 2, , , , , , ,CO NO NO CH O H O CFC 2 2 2 4,H O C F

Key :0007.00

447. 100ml of sample of water requires 3.92 mg of 2 2 7K Cr O in presence of 2 4H SO for the

oxidation of dissolved organic matter present in it. The COD of the water sample in

PPM is

Key :0006.40

448. Total number of hybrid orbitals present in the carbon atom of the gas involved in

Bhopal gas tragedy?

Key :0006.00

449. Amongst the following, the total number of compounds which will undergo addition

reaction will be:

A) 3 2CH CH CH B) 2CH

C)

3 2CH C CH

3CH D) 2Ph CH CH

E) 4CH F) 2 2CH CH

Key :0005.00

450. Total number of stereo isomeric products obtained by addition of bromine to 2-

pentene

Key :0004.00

451 Number of photons of lights with a wave length of 4000 pm necessary to provide one

joule of energy approximately 1610 .x Then x is

Key:2

452 Energy of a light particle is 196.625 10 J then wavelength of the particle is 310x A .

Then x is ____

Key:3

453 Number of photons of lights with a wave length of 4000 pm necessary to provide one

joule of energy approximately 1610x Thenx is_____

Key:2

454 Number of waves made by a Bohr electron in an orbit of maximum magnetic quantum

number ' 2 ' is ________

Key:3

455 The electronic velocity of 4th Bohr orbit is ' 'V The velocity of electron in the First

Bohr orbit would be _____ times of ' 'V

Key:4

456 How many waves are there in the sixth Bohr’s orbit of hydrogen.

Key:6

457 Radius ratio of 3rd orbit to 1st orbit of ‘H’ atom is

Key:9

458 The wavelength corresponding to a transition when electron falls from a certain

quantum level (n) to the ground state of an He ion is 24.31 nm. The velocity of the

electron in the next higher quantum level to that of velocity of light is

8.739 10 .x What is the value of .x

Key:7

459 Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of

photons emitted is 245.6 10 per second. The power of this laser is 13.3 10 .x J s What

is the values of ' 'x .

Key:6

460 Three isotopes of an element have mass number m, m 1& m 2 . If their ratio of

abundance is 4:1:1 and mean mass is 1mx

then x is

Key:2

461 The probability to find the electron of xyd orbital along z-axis

Key: 0

462 The maximum number of electrons that can have principal quantum number, 3,n and

spin quantum number, 1 ,2sm is

Key:3

463 If m has seven values, the value of azimuthal quantum number should be ____

Key:3

464 The spin only magnetic moment of an ion of manganese is 3.87BM in its +x oxidation

number. The value of x is _____

Key:4

465 Which elements are investigated by Lassigne’s test and Beilstein’stest

(Separately and in total) ?Cl , S , N , P ,O , Br

Key:5

466 During detection of sulphur is lassign’s test a violet compound with formula

5" "xNa Fe CN NOS is formed. What is x ?

Key:4

467 How many compounds respond to Lassaign test for nitrogen giving prussian blue

colour?

Key:5

468 An alkaloid constains 17.28% of nitrogen and its molecular mass is 162. The number

of nitrogen atoms present in one molecule of alkaloid is _____

Key:2

469 An element X belongs to group 15 and 2nd period in the periodic table the atomic

number of elements is____

Key:7

470 The number of groups which contains only gaseous elements is _________

Key:1

471 Some properties are given below. Among them how many properties are considered

as periodic properties.

a) Ionisation potential b) Atomic radius

c) Atomic number d) Electron gain enthalpy

e) Metallic nature f) Valency

g) Valence shell electronic configuration

h) Atomic mass i ) Electronegativity

Key:7

472 For an element (X) the successive ionization energies, 1 2 3 4 5, , ,IE IE IE IE and IE are 800,

2427, 3658, 25024 and 32824 1kJ mol respectively, then what is the number of

valence electrons present in the element ?

Key:3

473 Ionisation energy of 3M is 217.6 eV compared to that of 54.4He eV . Thus, atomic

number of 3M is _________

Key:4

474 Number of carbon atoms in vinyl cyanide is ………

Key:3

475

When IUPAC name of following compound is given, then double bond and

substituent gets respectively X and Y numbers so the sum of (x + y) will be

Key:4

476

In this molecule

X = no. of 01 - carbon atoms

Y = no. of 02 - carbon atoms

Z = no. of 03 - carbon atoms

M = no. of 04 - carbon atoms

What is the value of X Y Z M ?2

Key:2

477 How many of the following elements have positive electron gain enthalpy values

, , , , , , , , , Be Mg Mn Zn Cd Hg Ne Ar P Na

Key:8

478 IP and EA values of an elements are 13.4 eV and 3.4 eV/atom, then its

electronegativity is/are

Key:3

479 The number of elements among the following, which have lower

electronegativity than oxygen atom, based on Pauling scale, is ______

F, Cl, Br, I, H, S, P, K, Ca

Key:8

480 No. of acidic oxides among the following is

Key:7

481 Find the number of bridge head carbons in ?

Key:2

482 Total sum of sp sp and sp s covalent bonds in acetylene

Key:3

483 The electrovalency of sodium in NaCl is

Key:1

484 Consider the following Born – Haber cycle for formation of 3MX S

Then calculate value 1

30q , here q1 is electron affinity of x(g) is KJ/Mole.

Key:5

485 No.of possible position isomers for Dichloro benzene is

Key:3

486 Number of hydrogens which can participate in tautomerism for the formation of

the following compound are

Key:8

487 100ml of 0.1M 3 2H PO is titrated with 0.1M NaOH. The volume of NaOH consumed in

this titration is 100xml. What is x

Key:1

488 A given solution of hydrogen peroxide is of 2.424% (w/v). Express this in terms of

volume strength as an integer

Key:8

489 A mixture of NaOH and 2 3Na CO requires 25 0.1ml M HCl using phenolphthalein as the

indicator. However, the same amount of mixture required 30ml of 0.1M HCl , when

methyl orange was used as the indicator. The molar ratio of NaOH and 2 3Na CO in the

mixture is :x y then the x y is

Key:5

490 The number of resonance structures for N is

Key:9

491 How many resonance structures can be drawn for the following molecule (including

the given)?

Key:3

492 At equilibrium, 1pK then the value of 0G will be equal to _____

Key:0

493 For the reaction A B C D , the initial concentration of A & B are equal but the

equilibrium concentration of ‘C’ is twice of equilibrium concentration of A. The

equilibrium constant is

Key:4

494 1 mole of gas A at 2atm pressure and 270C is present in a vessel and it is heated to 0327 C . A B C is established and 50% of A is dissociated. Find Kp

Key:2

495 The number of electrophiles among the following are 2BeCl , 2NO , 3O , 2 2 ,R O ROH

, 3Fe , 2Fe , 3,RMgX N , 2H O

Key:5

496 How many of the following are nucleophiles , , ,

Key:2

497 2Zn OH is a sparingly soluble salts with 194 10spK , in order to increase its

solubility to 40 M the pH of acid required is?

Key:4

498 What is the pOH of 0.1 M KB (salt of weak acid and strong base) at 25°C? (Given:

of B– = 7) bpK

Key:4

499 Amongst the following, the total number of compounds whose aqueous solution turns

red litmus paper blue is _____ .

4 2 42NH C O 3 2

Zn NO

3FeCl 2 3K CO 4 3NH NO LiCN

Key:3

500 How many of the statement(s) are correct

i) The nucleophile makes a rear attack in 2NS reaction and expels the leaving group

from front side. ii) 3 2CH O CH CH adds to HBr according to Anti-markownikoff’s

rule.

iii) The basicity of holgens decreases in the order ¯ ¯ ¯ ¯F Cl Br I , but the

nucleophillicity is reverse of it.

iv) The rate of 2NS reaction is independent of the polarity of the solvent.

v) Walden inversion is observed in 1NS

vi) Meisenheimer complex is resonance stable.

Key:3

501 The percentage hydrolysis of M/160 KCN solution at 25 C will be (Given for HCN, 106.4 10aK ) is _______ %

Key:5

502 The concentration of X in a solution saturated with 3AX 111.9 10Ksp and BX3

salts is 33 10 M . The Ksp of 3BX is 1210y . What is the value of ‘y’?

Key:8

503 When 1 mole of an ideal monoatomic gas is compressed adiabatically the internal

energy change involved is 24 cals. The temperature rise is

Key:8

504 A gas occupies 2 litres at STP. It is provided 58.63 joule heat so that its volume

becomes 2.5 litre at 1 atm. Calculate change in its internal energy_____ joule.

Key:8

KCN 2 4K SO NaCl

505 If 10 calorie of heat energy is added to a system and the system does 5 calorie of

work on the surroundings. What is the energy change of the system?

Key:5

506 A gas expand from against a constant pressure of 3 atm. The work done during

expansion is used to heat 4 moles of water of temperature 290K. Change in

temperature of water. (Specific heat of water ).

Key:2

507 One mole of an ideal monoatomic gas is mixed with one mole of an ideal diatomic

gas. The molar specific heat of the mixture at constant volume is (in Calories)

Key:4

508 The maximum number of structural isomers for an alkane hexane is

Key:5

509 The no. of structural isomers for 7 16C H

Key:9

510 Consider the following compounds : 4 3 3 3 3 2 3 3 2 2 2 3, , , ,CH CH CH CH OH CH CH CH CH CH CH CH CH

3 3 3 3,H C CH CH H C CH CH CH

3CH3CH 3CH

How many compounds can be prepared by Wurtz reaction in high yield?

Key:2

511 Number of dimerised products obtained when 3CH Cl , 2 5C H Cl and 3 2 2CH CH CH Cl are

together treated with Na in dry ether

Key:5

512 Ten litres of a sample of hard water contained 45 10 moles of 2MgCl . Its degree of

Hardness is ____ ppm.

Key:5

513 In the given reaction the value of x is …………

2 2 7 2 4 2 2K Cr O H SO xH O

5 2 4 22 5CrO K SO H O

Key:4

514 How many types of water is produced when a mixture of 2H , 2D and 2T is treated with

2O gas(Normal isotope of oxygen that is O -16)?

Key:6

515 How many of the following reaction intermediate are electron deficient

a) carbocation b) Nitrene c) carbene d) free radical e) carbanion

Key:4

516 What is the minimum quantity in grams of methyl iodide required for preparing one

mole of ethane by wurtz reaction is 142x g . Then ‘x’ is (Atomic mass of I=127)

Key:2

517. The relative humidity of air is 80% at 027 C .If the aqueous tension at the same

temperature is 27 mm Hg. The partial pressure of water vapour in the air will be in

______ mm

Key:21.6

518. Total number of electrophiles present in the following are

2 2 2 3 4 3 2, , , , , , , NH , BeCl ZnCl NO SO CN F CCl SnCl

Key:5

519. The value of Vapourdensity

Molecular weightof a gas is

Key:0.5

520. A certain quantity of a gas occupies 100ml when collected over water at 015 C and

750mm pressure. If it occupies 91.9ml in dry state at STP, the vapour pressure of

water at 015 C is in ----- mm

Key:13.2

521. For a certain gas, 2 a 0.24612atm mol and 2 12.67 10b l mol . Calculate the

inversion temperature for the gas in_____ Kelvin

Key:224.44

522 For the reaction A B C D , the initial concentration of A & B are equal but the

equilibrium concentration of ‘C’ is twice of equilibrium concentration of A. The

equilibrium constant is

Key:4

523 For the reaction 2 2 312

SO O SO , if we write XP CK K RT , then the value of x

is_______

Key:2

524 For the reaction 2 4 22 gN O NO , the degree of dissociation of 2 4N O is 0.2 at 1 atm.

Then the pK of 2 2 42NO N O is

Key:6

525 Out of 3 2 2 2 3: , , , : , , NH H O Cl SnCl NO BF and 3AlCl the number nucleophiles are…….

Key:3

526 Total number of electrophiles present in the following are

2 2 2 3 4 3 2, , , , , , , NH , BeCl ZnCl NO SO CN F CCl SnCl

Key:5

527 The ionic product of water at o60 C is 149.61 10 . The pH of water at o60 Cis :

Key:6.51

528 How many among the following species can be classified as Lewis acids?

Key:8

529 Identify number of nucleophilic substitution reactions in the given reactions?

A) B) Cl

.

alc KOH

C) D)

E) F)

Key:2.0

530 How many substrates will show rearrangement during reaction?

, , , , ,

, , , ,

Key:6

531 2 4

3 2 2.conc H SOCH CH OH X H O

Total number of 2sp hybrid orbtials in X are ______

Key:6

532 xM OH (producing xM and OH ions) has 124 10spK and solubility 410 .M The

value of x is:

Key:2.0

533 2Zn OH is a sparingly soluble salts with 194 10spK , in order to increase its

solubility to 40 M the pH of acid required is?

Key:4

534 Among the following salts how many salts undergo only anionic hydrolysis?

(i) NaCl (ii) 4NH Cl (iii) 4NH CN (iv) NaCN (v) KCN

Key:2

535 Identify number of nucleophilic substitution reactions in the given reactions?

A) B) C)

D) E) F)

Key:2.0

536 How many groups are /o p director in the electrophilic aromatic substitution?

3

32

O O

C M

i NH ii COH iii N O iv COOH

v OMe vi O vii Et viiie C NHN

Meix N x O HH S

Key:6

537 2( )Zn OH is a sparingly soluble salts with 194 10 spK , in order to increase its

solubility to 40 M the pH of acid required is?

Key:4

538 Among the following, the total number of physical properties which are extensive are:

(a) density (b) viscosity (c) Surface tension volume (d) dipolemoment (e) Volume

(f) specific heat (g) enthalpy (h) internal energy (i) entropy (j) Gibbs energy

Key:5

539 10 grams of argon gas is compressed isothermally and reversibly at a temperature of

from 10 L to 5 L. Calculate the work done for this process in multiple of

calories.

Key:1.03

540 When sodium propanoate heated with sodalime gives an alkane. No of carbon atoms

in the alkane

Cl

.

alc KOH

Key:2

541 Number of alkanes obtained on electrolysis of a mixture of 3CH COONa and

2 5C H COONa are

Key:3

542 If enthalpy of neutralization of HCl by NaOH is - 157kJmol and with 4NH OH is

150kJmol . Calculate enthalpy of ionization of 4NH OH aq

Key:7.0

543 An intimate mixture of ferric oxide,Fe2O3,and aluminium, Al, is used in solid fuel

rockets. Calculate the fuel value per cc ( kcal/cc) of the mixture. Heats of formation

and densities are as follows: 2 3H Al Of -399 kcal/mol, 2 3H Fe Of -199 kcal/mol

Density of 2 3Fe O 5.2 g / cc , Density of Al=2.7 g/cc Atomic Wt. of 56Fe , 27Al ,

16O

Key:4.0

544 Heat of combustion of A(s) is 110kcal mol and that of B s is 115 .kcal mol

Mixture containing 3 moles A(s) and x moles B(s) on combustion released 105 kcal of

heat. What is the value of ?x

Key:5.0

545 An alkane with molecular formula 5 12C H has primary, secondary as well as tertiary

hydrogen. It is heated with 2Br to give N substitution products, which are subjected to

fractional distillation. The total number of fractions obtained is F. Calculate the value

of .NF

Key:1.5

546 What is the minimum quantity in grams of methyl iodide required for preparing one

mole of ethane by wurtz reaction (Atomic mass of I=127)

Key:284.00

547 The mass of CaO will be required to remove the hardness of 1000 lit. of water

containing 65.17gm of 3 2Mg HCO is 50 y then ‘y’ is

Key:1

548 50 ml of water sample, containing temporary hardness only, required 0.1 ml of

50M HCl for complete neutralisation. Calculate the temporary hardness of water in ppm.

Key:2

549 How may number of monochlorinated products are obtained by 3-ethyl pentane :

Key:4.0

550 Number of hyper conjugate structure possible for

Key:9.0

551 For how many of the following compounds, all the resonating structure are equivalent

..

22 CH CHH CHC

HN

Key:4.0

552. Energy of a light particle is 196.625 10 J then wavelength of the particle is 310x A .

Then x is ____

Key: 3

553. A radio station is broadcasting programmes at 100 M Hz frequency. What is the wave

length ( in meters) of the radiation ?

Key:3

554. Among the compounds, Benzene, Carbon tetrachloride, Naphthalene, Benzoic acid,

Isooctane and Anthracene, how many can be purified by sublimation.

Key:3

555. The odd element in how many of the following can be estimated

usingcarius method ?

2 2 6 5 2 2 6 5, , , ,RCONH RCOCl NH OH C H COCH SO C H

6 5 3,C H SCH

Key:6

556. 0.4 g of an organic compound on kjeldahl’s analysis gave enough Ammonia to just

neutralize 20 ml of 0.1 2 4NH SO . What is the percentage of nitrogen in the compound.

Key:7

557. Find the number of compounds that can’t be estimated by Kjeldahls method

Key:6

558. 0.002 gm of an organic compound was treated according to Kjeldhal’s

method. 40.2 10 mol of 2 4H SO was required to neutralise. 3NH . The percentage of

2N is 7x %, then x is

Key:4

559. Among the halogens, F,Cl,Br ,I how many can be identified by Belistrien’s test

Key:3

560. In kjeldahl’s estimation of nitrogen, the Ammonia evolved from 0.5gms of

an organic compound neutralised 10ml of 1M 2 4H SO . The % of nitrogen in the

compound is (50+X)% what is ‘X ‘ ?

Key:6

561 The frequency of a radiation having a wave number 14 12 10 cm will be 24 1x 10 S . Then

the value of x is ____________

Key:6

562. Wavelength associated with an electron having KE 253.0 10 J is 710 .x m What is the

value of x adjusted to nearest integer?

Key:9

563. The probability to find the electron of xyd orbital along z-axis

Key:0

564. No. of nodal planes in 3d-orbital is/are _________

Key:2

565. The momentum of a micro particle is 6.627 24 110 . .secm Kg . It’s De-Broglie wave

length is 0xA . What is x ?

Key:1

566. According de Broglie the circumference of the third orbit is equal to ‘x’ . then what

is ‘x’?

Key:3

567.

When IUPAC name of following compound is given, then double bond and

substituent gets respectively X and Y numbers so the sum of (x + y) will be

Key:4

568. Find out the correct LOCATION for formyl group in the following organic

compound, when it’s correct IUPAC name is written.

Key:6

569. In the following, number of methyl group(s) as side chain is (are) ……..

Key:1

570. The volume of 0.150 molar HCl is required to neutralise 25ml of 0.120 molar

2Ba OH is 10 x ml then the value of x is

Key:4

571. Mole fraction of solute in an aqueous solution is 0.1 and the molality of that aqueous

solution is 0.17x then the value of x is

Key:6

572. 1M HC l and 2M HCl are mixed in volume ratio of 4 :1. The final molality of the

solution is 1.2 10x . The value of ‘x’ is

Key:0

573. The total number of contributing structures showing hyperconjugation (involving

C H bonds) for the following carbocation is :

Key:6

574. How many hyper conjugative structures are possible for 2 – butene?

Key:7

575. 32 3 2 2 108PA B solid A B g B g K atm what is equilibrium pressure (atm) if 2 3A B

is allowed to dissociate in a closed empty flask?

Key:9

576. The equilibrium constant for the reaction 2 2 2g g gH I HI is 2 at a certain

temperature. The respectively at equilibrium concentrations of 2H and HI are 12 .mol lit

. What is the equilibrium concentration (in moles/ltr)

Key:1

577. 2 2 32 2SO O SO , starting with 2 mole 2SO and 1 mole 2O in 1 litre flask, mixture

require 0.4 mole 4MnO in acidic medium, Hence cK is

Key:2

578. What is the minimum number of carbons present in alkane molecule which is

optically active

Key:7

579. The no. of structural isomers for 7 16C H

Key:9

580. The Kavalues of 3 4H PO are 310 , 810 and 1310 . The pH of a phosphate buffer

containing 0.1M 2 4NaH PO and 1M 2 4Na HPO is

Key:9

581. Amongst the following, the total number of compounds whose aqueous solution turns

red litmus paper blue is _____ .

KCN 2 4K SO 4 2 42NH C O NaCl 3 2

Zn NO

3FeCl 2 3K CO 4 3NH NO LiCN

Key:3

582. In 1 litre saturated solution of , 0.1 mol of

is added. The resultant concentration of in the

solution is . The value of “x” is.

Key:7

583. Mono bromo derivatives

The number of possible mono bromo products are (excluding stereo isomers)

Key:5

584. The number of Primary Hydrogen atoms in 2 – methyl butane

Key:9

585. The solubility product of 2SrF in water is 108 10 Calculate its solubility in 0.1 M of

NaF aqueous solution. If its solubility is expressed as 810y then when is the value of

‘y’ ?

Key:8

586. The combustion of 10 g coke raised the temperature of 1.0 kg water from to

. Calculate the calorific value of coke. (Specific Heat of ).

Key:4

587. Extensive properties among the following are Enthalpy, free energy, entropy, volume,

density, refractive index, viscosity, molarity, molality, pressure.

Key:4

588. A gas expand from against a constant pressure of 3 atm. The work done during

expansion is used to heat 4 moles of water of temperature 290K. Change in

temperature of water. (Specific heat of water ).

Key:2

589. One mole of an ideal monoatomic gas is mixed with one mole of an ideal diatomic

gas. The molar specific heat of the mixture at constant volume is (in Calories)

Key:4

590. Gas ‘ xA ’ has the ratio of specific heat capacities equal to 1.66, then the value of ‘x’

is_____

Key:1

591. The minimum number of carbon atoms to be present in an alkene to exhibit optically

activity is

Key:6

592. Find the total number of sigma bonds in ethylene?

Key:5

593. No. of 2sp hybrid carbon atoms present in allene is

Key:2

594. On catalytic reduction with 2 /H Pt how many alkenes will give n – butane ?

Key:2

595. The degree of hardness of a sample of water containing 12 mg of 4MgSO per kg of

water is x . Then 5x is

Key:5

596. The sum of protons, electrons and neutrons in the heaviest isotope of hydrogen is___

Key:4

597. 50 ml of water sample, containing temporary hardness only, required 0.1 ml of

50M HCl for complete neutralisation. Calculate the temporary hardness of water in ppm.

Key:2

598. No. of 2sp hybrid carbon atoms present in allene is

Key:2

599. How many products will be formed in this reaction?

Key:2

600. RMS velocity of a gas at a given temperature is how many times to the its most

probable velocity

Key:1.224

601. How many times the RMS Velocity of hydrogen at 027 C is that of Nitrogen at

0327 C .

Key:2.645

602. The RMS velocity of a gas at 00 C is 2.62 / secm . The RMS velocity of the same gas at 0819 C is _____ / secm

Key:5.24

603. A vessel of 25 liter capacity contains 10 moles of steam under pressure of 50.3 atm .

Calculate the temperature of steam using Vander waal’s equation in_____K (if for

water 2 25.46 a bar L mol and 10.031b L mol )

Key:1539.5

604. Under critical states for one mole of a gas , compressibility factor is :

Key:0.375

605. The no. of structural isomers for 7 16C H

Key:9

606. How many optically active lightest isomeric alkanes are theoretically possible with

2 2n nC H formula?

Key:4

607. In the equilibrium 2

2 2s aq aqCaF Ca F , if the concentration of F at new equilibrium

is double the concentration of F at old equilibrium, then concentration of 2Ca at the

new equilibrium will be how many times less than the concentration of 2Ca at the old

equilibrium.

Key:4

608. For the reaction A B C D , the initial concentration of A & B are equal but the

equilibrium concentration of ‘C’ is twice of equilibrium concentration of A. The

equilibrium constant is

Key:4

609. Ammonium carbonate is heated at 227 C in a closed vessel of volume 8210 ml

containing 0.2mole of Argon gas. The manometer attached to the vessel shows a

pressure of 1 atm. Find pK for the decomposition of ammonium carbamate.

2 4 3 2NH COONH (s) 2NH (g) CO (g) Key:0.0

610. The ionic product of water at 060 C is 149.61 10 . The pH of water at 060 C is

Key:6.51

611. The number of structural isomers for 6 14C H

Key:5

612. Find out number of dimerize products obtained by the following reaction

3 3 2 3 2 2Na

dry etherCH Cl CH CH Cl CH CH CH Cl

Key:5

613. If 3-bromo-4-methylhexane is treated with ethanolic KOH solution, how many

different alkenes would be formed?

Key:6

614. How many among the following species can be classified as Lewis acids?

Key:8

615. Calculate the pH of solution made by mixing 50ml of 0.2M 4NH Cl & 75 ml of 0.1 M

53 1.8 10bNaOH K of NH

Key:9.73

616. Calculate the amount of 4 42NH SO in grams which must be added to 500 ml of

30.2M NH to give a solution of 9.3pH . Given bpK for 3 4.7NH Key:6.6

617. The Ka of an indicator HInis 49 10 . The percentage of basic form of indicator is 10x

in a solution of pH is 4. What is x?

Key:9

618. 2, 2, 4-trimethyl pentane 2 /Cl hv n monochlorinated products. The value of n is

Key:4.0

619. How many products are possible for monochlorination of propane

Key:2.0

620. The spK of A3B salt in water is 3

123 1016

and it ionises as 1 33 3A B A B

, its solubility in water is 1 10 yx

then ?x y

22 33 32 3CCl , BCl , BI , FeCH , Cl , CO , , AlCl

Key:5

621. In 1 litre saturated solution of 101.6 10spAgCl K AgCl , 0.1 mol of

61.0 10spCuCl K CuCl is added. The resultant concentration of Ag in the

solution is . The value of “x” is.

Key:7

622. Among the following, find the total number of intensive properties?

Temperature, pressure, density, Surface Tension, melting point, Boiling point, Mass

Key:6

623. No of meso products formed in the following reaction is…

Key:0

624. The number of alkenes having higher heat of combustion than but-1-ene is Ethene,

propene, cis – but-2-ene, trans – but-2-ene, pent-1-ene, 2-methyprop-1-ene

Key:1

625. Enthalpy of combustion of 4CH gas is 890.3 KJ/mol. When 445.15KJ of heat is

evolved , the number of grams of 2CO released in the combustion is 44x

grams, the

value x is ____

Key:2

626. Heat of neutralisation of a polybasic acid by strong base is 154.8 .kcal mol What is

basicity of the acid?

Key:4.00

627. The enthalpy of polymerization of ethene per mol is calculated to be 19x kJ mol from

the data given below ,C C C CH H at 298 K are + 590 and 1331 kJ mol what is the

value of x?

Key:8

628. The number of alkenes (open chain as well as cyclic) of six carbon giving same

product with HBr in presence of peroxide and absence of peroxide.

Key:7.0

629. How many of the following addition reaction are syn addition reaction

A) B)

C)2 4,

3 3

H Pd BaSO

H C C C CH

D)3, .

3 3

Na Liq NH

H C C C CH

E)

Key:3

630. The maximum possible number of hydrogen bonds a water molecule can form in ice

is……….

Key:4

631. What is the sum of protons, electrons and neutrons in the heaviest isotope of

hydrogen?

Key:4.00

632. The mass of CaO will be required to remove the hardness of 1000 lit. of water

containing 65.17gm of 3 2Mg HCO is 50 y then ‘y’ is

Key:1

633. Among the following, the number of compounds, which can participate as ‘diene’

component in a Diels-Alder reaction is __.

Key:6

634. No of moles of methanal formed on ozonolysis of 1, 3 – butadiene

Key:2

635. 5.0 ml of 2 2H O solution liberates 1.02 gm of 2I from an acidified KI solution.

Calculate the strength of 2 2H O solution in terms of volume strength at STP.

Key:9.00

636. LiCl is deliquescent and crystallizes as a hydrate 2.LiCl xH O . Find the value of ‘x’.

Key:2.00

637. The volume of perhydrol required to get 1 Lit. of Oxygen gas at STP is 2x ml. Then x

is

Key:5.00

638. Total number of stereo isomeric products obtained by addition of bromine to 2-

pentene

Key:4.00

639. The number of alkenes having higher heat of combustion than but-1-ene is Ethene,

propene, cis – but-2-ene, trans – but-2-ene, pent-1-ene, 2-methyprop-1-ene

Key: 1.00