JIPMER-03-06-2018-Evening

Chemistry

1. If osmotic pressure of 4% (w/v) solution of sucrose is same as

2%(w/v) solution of 'X' find molecular mass of X.

(1) 570

(2) 205.2

(3) 171

(4) None of these

2. Find out products of hydrolysis of NaCl solution on cathode

and anode

(1) 2 2H , Cl

(2) 2 2Cl , H

(3) 2Na, Cl

(4) 2Na, O

3. Find relation b/w

(1) Functional Isomer

(2) Tautomers

(3) Chain Isomer

(4) Metamers

4. Which is suitable reagent for wurtz reaction:

(1) Na/ether

(2) Na/alcohol

(3) Zn/ether

(4) Zn/alcohol

5. Which of the following pair behaves strong and weak base

hydride 3 3 3 3 3NH , PH , AsH , SbH , BiH

(1) 3 3NH , PH

(2) 3 3NH , BiH

(3) 3 3PH , BiH

(4) 3 3BiH , AsH

6. Which of the following becomes paramagnetic on heating at

850 K?

(1) MnO

(2) 3 4Fe O

(3) 2 4ZnFe O

(4) (2) & (3) both

7. What is the formula of Marshalls acid

(1) 2 2 8H S O

(2) 2 4H SO

(3) 2 2 6H S O

(4) 2 5H SO

8.

Final product will be:

(1)

(2)

(3)

(4)

9. Oxidation number of Cr in ( )3 24Cr NH Cl

+

(1) 4+

(2) 2+

(3) 3+

(4) 6+

10. Which one of the following species is paramagnetic in nature?

(1) 4V +

(2) 3Sc +

(3) 5V +

(4) 2Zn +

11. Given that, for the reaction,

2 21 1H Cl HCl2 2

+ →

( )HCl 93 kJ/molfH∆ = −

( ) ( )2 2B.E H 434 kJ/mol, B.E Cl 242 kJ/mol= =

The bond dissociation energy of HCl is

(1) 232 kJ/mol

(2) 331 kJ/mol

(3) 431 kJ/mol

(4) 530 kJ/mol

12. In the extraction of copper from its sulphide ore, the metal is

formed by the reduction of 2Cu O with

(1) FeS

(2) CO

(3) 2Cu S

(4) 2SO

13. For the following reaction,

( ) ( ) ( ) ( )23 2 2 22NH CO NH CONH H Og g aq l+ +

,

113.6 kJmolG −∆ ° = − at 298 K. Then log eqK for this

equilibrium is

(1) 3.41−

(2) 2.38

(3) 120

(4) 1500

14. Xenon hexafluoride reacts with silica to form a xenon

compound X. The oxidation state of xenon in X is

(1) +2

(2) +4

(3) +6

(4) 0

15. Neopentyl chloride reacts with benzene in presence of a Lewis

acid ( )3AlCl to form

(1)

(2)

(3)

(4)

16. Lead is extracted from galena (PbS), either by following ways.

(i) 2 2

Roasted in air Heated with CSO COPbS PbO Pb− −→ →

(ii) 2 2

Roasted in air Heated with PbS2SO COPbS PbO Pb SO− −→ → +

Auto-reduction process is

(1) i

(2) ii

(3) Both (i) and (ii)

(4) None of these

17. In the reaction,

The major product formed is

(1) 6 5 2C H CH CHO− −

(2) 6 5C H COOH−

(3) 6 5C H CH CH COOH− = −

(4) 6 5 3C H CH CH COOH− = −

18. Which one of the following represents the correct structure of

cellulose?

(1) Branched, ( )1, 4α and ( )1, 6β - glucose

(2) Unbranched, ( )1, 6α - glucose

(3) Branched, ( )1, 4α - glucose

(4) Unbranched, ( )1, 4β - glucose

19. The correct formula for plaster of Paris is

(1) 4 2CaSO 4H O⋅

(2) 4 2CaSO 2H O⋅

(3) 4 21CaSO H O2⋅

(4) 4 2CaSO 1H O⋅

20. The value of CK for the reaction,

2A B C+

is 32 10−× . At a given time, the composition of

reaction mixture is [ ] [ ] [ ] 43 10 MA B C −= = = × . In which

direction, the reaction will proceed?

(1) Forward direction

(2) Reverse direction

(3) No net reaction occur

(4) None of these

21. Which of the following chemicals are used to manufacture

methyl isocyanate that caused "Bhopal tragedy"?

(i) Methylamine (ii) Phosgene

(iii) Phosphine (iv) Dimethylamine

(1) (i) and (ii)

(2) (iii) and (iv)

(3) (i) and (iii)

(4) (ii) and (iv)

22. The correct order of ease of adsorption of the hydrated alkali

metal ions on an ion exchange resin is

(1) Rb K Na Li+ + + +> > >

(2) Li K Na Rb+ + + +< < <

(3) Na Li K Rb+ + + +< < <

(4) K Na Rb Li+ + + +< < <

23. Identify the major product that is obtained on treatment of

( )3 2 3CH CH CH F CH with 3 3CH O / CH OH− is

(1) ( )3 2 3 3CH CH CH OCH CH

(2) 3 3CH CH CHCH=

(3) 3 2 2CH CH CH CH=

(4) 3 2 2 2 3CH CH CH CH OCH

24. Among the following, the non-aromatic heterocyclic

compound is

(1) piperidine

(2) pyrrole

(3) furan

(4) pyridine

25. If Na+ ion is larger than 2Mg + ions and 2S − ion is larger than

Cl− ion, which of the following will be stable salt in water?

(1) Sodium chloride

(2) Sodium sulphide

(3) Magnesium sulphide

(4) Magnesium chloride

26. Product P is

(1)

(2)

(3)

(4)

27. Which of the following is correct statement?

(1) Aluminium dissolves in dilute mineral acids but is made

passive by concentrated nitric acid.

(2) Aluminium vessel can be used as storage of NaOH.

(3) Aluminium chloride does not dissociate in water.

(4) AlF3 is soluble in anhydrous HF.

28. If molar conductivity of 2Ca + and Cl− ions are 119 and 2 171Scm mol− respectivily, then the molar conductivity of

2CaCl at infinite dilution is

(1) 2 1215 Scm mol−

(2) 2 1340 Scm mol−

(3) 2 1126 Scm mol−

(4) 2 1261Scm mol−

29. An atom forms face centered cubic crystal with density

8.92 g/mLd = and edge length 83.6 10 cma −= × . The

molecular mass of atom in amu is

(1) 98 amu

(2) 63 amu

(3) 32 amu

(4) 93 amu

30. In a crystalline sold, having formula 2 4XY O , oxide ions are

arranged in cubic close packed lattice while cations X are

present is tetrahedral voids and cations Y are present in

octahedral voids. The percentage of tetrahedral voids occupied

by X is

(1) 12.5%

(2) 25%

(3) 50%

(4) 75%

31. Conversion of oxygen into ozone is non-spontaneous at

(1) low temperature

(2) all temperature

(3) high temperature

(4) room temperature

32. A 100 mL flask contained H2 at 200 torr, and a 200 mL flask

contained He at 100 torr. The two flask were then connected so

that each gas filled their combined volume. Assume, no change

in temperature, total pressure is

(1) 104 torr

(2) 163.33 torr

(3) 279 torr

(4) 133.33 torr

33. For the dot structure shown, the most likely elements X = __

and Y = __ are

(1) carbon, fluorine

(2) carbon, hydrogen

(3) carbon, oxygen

(4) oxygen, carbon

34. Valence electrons in the element X are 3 and that in element Y

is 6. Most probable compound formed from X and Y is

(1) 2X Y

(2) 2XY

(3) 6 3X Y

(4) 2 3X Y

35. A compound, containing only carbon, hydrogen and oxygen

has a molecular weight of 44. On complete oxidation, it is

converted into a compound of molecular weight is 60. The

original compound is

(1) alcohol

(2) acid

(3) aldehyde

(4) ether

36. Number of photons emitted by a 100 W (J s-1) yellow lamp in

1.0 s is

(λ of yellow light is 560 nm)

(1) 181.6 10×

(2) 181.4 10×

(3) 202.8 10×

(4) 202.1 10×

37. In Kjeldahl's method, the nitrogen present in an organic

compound is quantitatively converted into

(1) gaseous ammonia

(2) ammonium sulphate

(3) ammonium phosphate

(4) ammonia

38. In the reversible reaction, 1

22 2 42NO N Ok

k

the rate of

disappearance of 2NO is equal to

(1) [ ]212

2

2 NOkk

(2) [ ] [ ]21 2 2 2 42 NO 2 N Ok k−

(3) [ ] [ ]21 2 2 2 42 NO N Ok k−

(4) ( )[ ]1 2 22 NOk k−

39. If ( )2 , 0.763 VE Zn Zn+° = − and ( )2 , 0.44 VE Fe Fe+° = − , then

the emf of the cell ( ) ( )2 20.001 0.005Zn Zn a Fe a Fe+ += = is

(1) equal to 0.323 V

(2) less than 0.323 V

(3) greater than 0.323 V

(4) equal to 1.103 V

40. For the electrochemical cell, 3Ag AgCl KCl AgNO Ag− + , the

overall cell reaction is

(1) ( )Ag KCl AgCl s K+ ++ → +

(2) 2122

Ag AgCl Ag Cl+ → +

(3) ( )AgCl s Ag Cl+ −→ +

(4) ( )Ag Cl AgCl s+ −+ →

41. Which one of the following electrolytes has the same value of

van't Hoff factor (i) as that of ( )4 6K Fe CN ?

(1) ( )2 4 3Al SO

(2) 2 4K SO

(3) ( )3 6K Fe CN

(4) ( )3 3Al NO

42. The van't Hoff factor for 0.1 M ( )3 2Ba NO solution is 2.74.

The degree of dissociation is

(1) 91.3%

(2) 87%

(3) 100%

(4) 74%

43. The IUPAC name of the following compound is

(1) 3-propylpent-1-ene

(2) 3-ethylpent-1-ene

(3) 4-ethylhex-1-ene

(4) 3-ethylhex-1-ene

44. Bleeding due to a cut can be stopped by applying ferric

chloride solution in the laboratory. This is due to

(1) coagulation of negatively charged blood particles by 3Fe +

ions.

(2) coagulation of positively charged blood particles by Cl−

ions.

(3) reaction taking place between ferric ions and the

haemoglobin forming a complex.

(4) common element, iron, in both 3FeCl and haemoglobin.

45. Relative stabilities of the following carbocations will be in the

order

3 3 2 3CH CH CH OCH(A) (B) (C)

⊕ ⊕

(1) C > B > A

(2) C < B < A

(3) B > C > A

(4) C > A > B

46. Which of the following is not a surfactant?

(1) ( ) ( )3 2 315 3CH CH N CH Br+ −− −

(2) ( )3 2 2 214CH CH CH NH− −

(3) ( )3 2 2 216CH CH CH OSO Na− +− −

(4) ( )2 214OHC CH CH COO Na− +− − −

47. Arrange the following polymers in increasing order of their

intermolecular forces.

Nylon-6, 6, buna-S, polythene, neoprene

(1) Neoprene < buna-S < nylon-6, 6 < polythene

(2) Neoprene < buna-S < polythene < nylon-6, 6

(3) Polythene < nylon-6, 6 < buna-S < neoprene

(4) Polythene < buna-S < nylon-6, 6 < neoprene

48. In adiabatic conditions, 2 mole of 2CO gas at 300 K is

expanded such that its volume becomes 27 times. Then, the

work done is

( )6 cal mol and 1.33VC γ−= =

(1) 1400 cal

(2) 1000 cal

(3) 900 cal

(4) 1200 cal

49. The compounds and

are distinguished by

(1) 6 5 2 2C H SO Cl and OH in H O−

(2) 3 2AgNO in H O

(3) dilute HCl

(4) 2HNO and β-naphthol

50. Alkali metals readily dissolve in liquid ammonia to give blue

coloured solutions. The blue colour is believed to be due to

(1) ammoniated cations

(2) ammniated anions

(3) ammoniated electrons

(4) ammoniated cations and ammoniated electrons

51. ( ) 2 3i CO CH OH/HMg/ether3 (ii) WaterCH Br P

+

∆− →→→

What is the product 'P' in the above reaction?

(1) Methyl ehanoate

(2) Ethanoic acid

(3) Propanal

(4) Methyl propanoate

52. Which of the following is disproportionation reaction?

(1) 4 2 2 2CH 2O CO 2H O+ → +

(2) 4 2 4CH 4Cl CCl 4HCl+ → +

(3) 2 2 22F 2OH 2F OF H O− −+ → + +

(4) 2 2 3 22NO 2OH NO NO H O− − −+ → + +

53. Which type of drugs come under anti-microbial drugs?

(1) Antiseptics, antacids, antihista mlnes

(2) Tranquilizers, antiseptics, antifertility

(3) Tranquilizers, analgesics, antiseptics

(4) Antiseptics, antibiotics, disinfectants

54. When hydrogen peroxide is added to acidified solution of

dichromate 22 7Cr O − , a deep blue coloured complex of chromic

peroxide 5CrO is formed. Oxidation state of Cr in 5CrO is

(1) +5

(2) +3

(3) +6

(4) 10−

55. When phenol is treated with CHCl3 and NaOH followed by

acidification, salicylaldehyde is obtained. Which of the

following species is involved in the above mentioned reaction

as intermediates?

(1)

(2)

(3)

(4)

56. Which of the following is the correct sequence of step involved

in the mechanism of Cannizzaro reaction?

(1) Nucleophilic attack, transfer of H− and transfer of H+

(2) Transfer of H− , transfer of H+ and nucleophilic attack

(3) Transfer of H+ , nucleophilic attack and transfer of H−

(4) Electrophilic attack by OH− , transfer of H+ and transfer

of H−

57. Red blood cells are placed in a solution and neither haemolysis

nor crenation occurs. Therefore, the solution is

(1) hypertonic

(2) hypotonic

(3) isotonic

(4) isotopic

58. If M is element of actinoids series, the degree of complex

formation decreases in the order.

(1) 4 3 22 2M M MO MO+ + + +> > >

(2) 4 2 32 2M MO M MO+ + + +> > >

(3) 2 3 42 2MO MO M M+ + + +> > >

(4) 2 4 32 2MO MO M M+ + + +> > >

59. A chemical reaction was carried out at 300 K and 280 K. The

rate constant were found to be 1k and 2k respectively, then

(1) 2 14k k=

(2) 2 10.25k k=

(3) 2 12k k=

(4) 2 10.5k k=

60. Which of the following compound can exhibit tautomerism?

(1)

(2)

(3)

(4)

Answer Key

1 3 26 2 51 1 76 1 101 1 126 2 151 1 176 2

2 1 27 1 52 4 77 2 102 2 127 2 152 2 177 4

3 1 28 4 53 4 78 1 103 3 128 1 153 3 178 1

4 1 29 2 54 3 79 2 104 3 129 2 154 1 179 2

5 2 30 1 55 1 80 2 105 2 130 3 155 1 180 1

6 4 31 3 56 1 81 2 106 2 131 1 156 1 181 3

7 1 32 4 57 3 82 2 107 3 132 4 157 1 182 2

8 4 33 1 58 2 83 1 108 1 133 4 158 1 183 3

9 3 34 4 59 2 84 2 109 1 134 1 159 1 184 1

10 4 35 3 60 2 85 1 110 1 135 2 160 1 185 4

11 3 36 3 61 3 86 2 111 2 136 1 161 1 186 2

12 3 37 4 62 1 87 1 112 4 137 3 162 2 187 4

13 2 38 2 63 1 88 2 113 1 138 3 163 2 188 2

14 3 39 3 64 1 89 1 114 1 139 3 164 4 189 4

15 2 40 3 65 2 90 1 115 2 140 1 165 1 190 3

16 2 41 1 66 2 91 3 116 1 141 2 166 1 191 4

17 3 42 2 67 4 92 3 117 2 142 1 167 1 192 2

18 4 43 4 68 1 93 1 118 2 143 4 168 1 193 3

19 3 44 1 69 1 94 1 119 2 144 1 169 3 194 2

20 2 45 1 70 3 95 2 120 1 145 1 170 1 195 4

21 1 46 2 71 1 96 3 121 1 146 1 171 1 196 3

22 1 47 2 72 2 97 1 122 2 147 1 172 1 197 3

23 2 48 4 73 2 98 3 123 1 148 2 173 3 198 1

24 1 49 4 74 1 99 4 124 2 149 1 174 4 199 1

25 3 50 3 75 1 100 4 125 2 150 1 175 3 200 1

JIPMER-03-06-2018-Evening

Solutions - Chemistry

1. The molecular mass of sucrose is 342.

Write the expression to find the molecular mass of X.

1 1 2 2i c i c=

Substitute the values.

4 1000 2 1000342 100 M 100

2M 3424171

×= ×

×

= ×

=

2. The hydrolysis at cathode is as follows.

2 2H O H 2OH−→ +

The hydrolysis at anode is as follows.

22Cl Cl 2e− −→ +

3. Consider the given structures.

This is an alcohol.

This is an enol.

Therefore, these are functional isomer and have different

chemical properties.

4. The Wurtz reaction is as follows, Na

etherR X R R− → −

Therefore, the suitable reagents for Wurtz reaction are

Na/ether.

5. The order of basic nature of each compound is as follows,

3 3 3 3 3NH PH AsH SbH BiH> > > >

Therefore, the pair of strong and weak base hydride is 3NH ,

and 3BiH .

6. Ferrimagnetic change their nature on heating and become

magnetic.

For example,

3 4 2 4 2 4Fe O , ZnFe O , MgFe O

7. The formula of Marshalls acid is 2 2 8H S O .

8. The complete chemical reaction is as follows,

9. Find the oxidation number of Cr in ( )3 24Cr NH Cl

+ as

follows,

( ) ( )x 4 0 1 2 1x 2 1

x 3

+ × + − × = +

− = += +

Therefore, the oxidation number of Cr in ( )3 24Cr NH Cl

+ is

3+ .

10. The table shows the electronic configuration and number of

unpaired electrons of the given species.

Species Atomic

Number

Electronic

Configuration

Unpaired

Electrons 4V + 23 [ ] 1

18Ar 3d 1

3Sc + 21 [ ] 018Ar 3d 4

5V + 23 [ ] 018Ar 3d 2

2Zn + 30 [ ] 018Ar 3d 2

Thus, option (4) is correct.

11. Given,

2 21 1H Cl HCl2 2

+ →

( )HCl 93 kJ/molfH∆ = −

Let the bond dissociation energy of H-Cl bond is x.

For given reaction,

( ) ( )

( ) ( )

reactants products. .

1 193 434 2422 2431 kJ/mol

fH B E B E

x

x

∆ = −

− = + −

=

∑ ∑

12. In the extraction of copper from its sulphide ore, the metal is

formed by the reduction of 2Cu O with 2Cu S. The chemical

reaction occurring in this reaction is shown below.

2 2 2 2

2 2 2

2Cu S 3O 2Cu O 2SO1 1Cu O Cu S 3Cu SO2 2

+ → + ↑

+ → +

During cooling of molten copper, dissolved 2SO comes out in

the form of blisters, so it called blister copper.

13. The expression of Gibb's free energy is,

2.303 log eqG RT K∆ ° = −

Substitute values,

( )( )313.6 10 2.303 8.314 298 loglog 2.38

eq

eq

KK

− × = −

=

14. The chemical reaction of xenon hexa fluoride with silica is

shown below.

6 2 4 42XeF SiO 2XeOF SiF+ → +

The oxidation state of Xe in XeOF4 is calculated as,

( ) ( )1 2 4 1 06

xx

+ − + − =

= +

15. The reaction is shown below.

Thus, option (2) is correct.

16. There is no requirement of external reducing agent in auto-

reduction reaction. Thus, only reaction (ii) is called auto-

reduction.

17. The given reaction is a Perkin condensation reaction. The steps

in this process is shown below.

18. The structure of cellulose is shown below.

Thus, option (4) is correct.

19. The chemical formula of Plaster of Paris is, 4 21CaSO H O2⋅ .

20. The reaction quotient for the given reaction is,

[ ][ ][ ]2CB C

QA

=

Substitute values,

( )( )( )

4 4

24

3 10 3 10

3 10

1

CQ− −

−

× ×=

×

=

Since C CQ K> , so the reaction will proceed in reverse

direction.

21. Methyl isocyanate is prepared by the reaction of methyl amine

and phosgene as shown below,

22. The order of the size of the alkali metal ions is,

Li Na K Rb+ + + +> > > .

The ease of adsorption of hydrated alkali metal ions on an ion

exchange resign decreases as the size of the alkali metal ion

increases.

So, the order of ease of adsorption is,

Rb K Na Li+ + + +> > >

23. The reaction will occur according to Saytzeff's rule as shown

below,

( )( )

( )

3

3

CH O3 2 3 3 3CH OH

Major

3 2 2Minor

CH CH CH F CH CH CH CHCH

CH CH CH CH

−

→ =

+ =

24. Pyridine is aromatic compound. The structure of pyridine is

.

Pyrrole is also aromatic. The structure of pyrrole is .

Furon follows Huckels rule and other conditios for a compound

to be arromatic. The structure of furan is .

Piperdine is non-aromatic because it does not follows 4n+2

rule. The structure of piperdine is .

25. Higher the lattice energy, lower the solubility and more stable

the salt in water. So, among the four given combinations, the

lattice energy of MgS is higher than those of 2 2Na S, MgCl and

NaCl. Thus, MgS is stable salt in water and least soluble salt.

26. The process of chemical reaction is shown below.

Thus, option (2) is correct.

27. Aluminium is made passive by HNO3 due to formation of

oxide layer. Hence, HNO3 does not react further but other acids

react.

The reaction of NaOH with Al is shown below,

2 2 22NaOH 2Al 2NaAlO 3H 2H O+ → + + . So NaOH cannot be

stored in a Al vessel.

Aluminium chloride dissociate in water.

3AlF is insoluble in anhydrous HF.

So, option (1) is correct.

28. Given data,

2 2 1

2 1

Ca 119 Scm molCl 71Scm mol

+ −

− −

Λ° =

Λ° =

So, 2

2

2 1

CaCl Ca 2 Cl119 2 71261Scm mol

+ −

−

Λ° = Λ° + ×Λ°= + ×

=

29. The expression of the molar mass is, 3

0N aMZ

ρ=

Substitute values,

( )( )( )323 88.92 6.023 10 3.6 10M

462.663 amu

−× ×=

=≈

30. Since, the formula shows the presence of 4 oxide ions, the

number of tetrahedral voids is eight and that of octahedral

voids is four. Out of the eight tetrahedral voids, one is occupied

by X.

So, the percentage of tetrahedral voids occupied is,

1n 100812.5%

= ×

=

31. Conversion of oxygen into ozone is non-spontaneous at high

temperature because ozone is not stable at high temperature.

32. The number of moles of hydrogen is,

2HpVnRT20000

RT

=

=

The number of moles of hydrogen is,

He20000n

RT=

The total number of moles is,

20000 20000nRT RT

40000RT

= +

=

Total volume is, V 300 mL=

The total pressure is,

nP RTV40000RTRT 300

133.33 torr

=

=×

=

33. X is tetravalent without lone pair, so X is carbon. Y has three

lone pair and one bond pair, so Y is flurine.

34. From given information, it can be concluded that X is

electropositive and Y is electronegative. So, X exists as 3X +

and Y as 2Y − . So the compound is 2 3X Y .

35. After complete oxidation, the molecular weight of obtained

compound found to be increased by 16. This means oxygen

atom is added here. The reaction is, [ ]ORCHO RCOOH→

So, the original compound must be an aldehyde.

The aldehyde with molecular weight 44 is acetaldehyde.

36. The expression of the number of photons is,

Enhcλ

=

Substitute values,

( )( )( )( )

9

34 8

20

100 1 560 106.626 10 3 10

2.82 10

n−

−

× ×=

× ×

= ×

37. In Kjeldahl's method, the nitrogen present in an organic

compound is quantitatively converted into ammonia.

38. The rate of reaction is,

[ ]

[ ] [ ]

2

21 2 2 2 4

NO12NO N O

dR

dtk k

= −

= −

The rate of disappearance is,

[ ] [ ] [ ]221 2 2 2 4

NO2 2 N O

dk NO k

dt− = −

39. The cell reaction is, 2 2Zn Fe Zn Fe+ ++ → +

From the Nernst equation,

2

2

0.0591log Zncell cell

Fe

aE E

n a+

+

°= −

Substitute values,

( ) 0.0591 0.0010.763 0.44 log1 0.005

0.364 V

cellE = − −

=

40. The cell reaction is shown below,

( ) ( )( )

AgCl s e Ag Cl aq

Ag Ag aq e

− −

+ −

+ → +

→ +

So, the overall reaction is,

( )AgCl s Ag Cl+ −→ +

41. The van't Hoff factor for the given molecules is shown below.

( )

( ) ( )( )

( ) ( )

3 22 4 43

22 4 4

33 6 6

33 33

44 6 6

Al SO 2Al 3SO

K SO 2K SO , i 3

K Fe CN 3K Fe CN , i 4

Al NO Al 3NO , i 4

K Fe CN 4K Fe CN , i 5

+ −

+ −

++

+ −

−+

+

+ =

+ = + =

+ =

Thus, ( )2 4 3Al SO has same value of van't Hoff factor as that of

( )4 6K Fe CN .

42. Consider the reaction,

( ) 23 32Ba NO Ba 2NO

Initial 1 mole 0 0Final 1 2

+ −+

−α α α

Total number of moles is, n 1 2

1 2= −α +α + α= + α

So, the van't Hoff factor is, i 1 2= + α

Solve further,

i 12

2.74 12

0.87%

−α =

−α =

α =

Thus, the percentage dissociation is 87.

43. The correct IUPAC name of the given compound is 3-

ethylhex-1-ene.

44. Bleeding due to a cut can be stopped by applying 3FeCl or

alum solution. This is because of coagulation of negatively

charged colloidal blood particles by positively charged 3Fe +

ions.

45. More the number of alkyl groups, the greater is the dispersal of

positive charge and hence more is the stability of carbocation.

Thus, the correct order is, C > B > A.

46. In each surfactant, there is two parts; a hydrophobic part and a

hydrophilic part.

The compound ( )3 2 2 214CH CH CH NH contains only

hydrophobic part but no hydrophilic part. So it is not a

surfactant.

47. The increasing order of intermolecular forces in polymers is,

elastomers < plastics < fibres.

Since neoprene and buna -S are elastomers, polythene is plastic

and nylon-6, 6 is a fibre.

So the required order is,

Neoprene < buna-S < polythene < nylon-6,6

48. In adiabatic conditions,

1

2 1

1 2

1.33 1127

13

T VT V

γ −

−

=

=

=

Solve further,

2

2

1300 3

100 K

T

T

=

=

Since 2 1T T< , so cooling takes place due to expansion under

adiabatic condition.

( )0 for adiabatic changeve because gas expands

E q WE W qE

∆ = +

∆ ≠ =

∆ = −

So,

( )( )

2 1

6 100 3001200 cal

V

W EC T T

= −∆

= − −

= − −

=

49. The reaction of is shown below,

The reaction of is shown below,

50. The blue coloured solution is due to ammoniated electrons. The

reaction is shown below.

( ) ( ) ( ) ( )3 3 3Blue colour

x yNa s x y NH Na NH e NH+ −+ + → +

51. The required reaction is shown below.

52. The disproportionation reaction is the reaction in which same

substance is oxidized as well as reduced.

In reaction of 2NO and OH − , N is both oxidized and reduced.

So, option (4) is correct.

53. Antibiotics, antiseptics and disinfectants are antimicrobial

drugs.

54. When 2 2H O is added to an acidified solution of dichromate 2

2 7Cr O − a deep blue complex chromic peroxide ( )5CrO is

formed.

The structure of the blue complex is shown below.

So, the oxidation state of Cr is calculated as,

( ) ( )1 4 2 06

xx

+ − + − =

= +

55. When phenol is treated with CHCl3 and NaOH followed by

acidification, salicylaldehyde is obtained. This is a Riemer

Tiemann reaction. This reaction is shown below.

56. Cannizzaro reaction involves the aldehydes which do not have

an α -hydrogen atom, undergo self oxidation and reduction

reaction on heating with conc. alkali. conc.KOH

3HCHO HCHO CH OH HCOOK++ → +

57. Red blood cells are placed in a solution and neither haemolysis

nor crenation occurs. So, the solution is isotonic in nature and

there is no process of osmosis takes place.

58. The higher the charge on the metal ion, smaller is the ionic size

and more is the complex forming ability.

So, the degree of complex formation decreases in the order as

shown below. 4 2 3

2 2M MO M MO+ + + +> > >

59. For every 10 C° rise, rate constant gets doubled. For every

20 C° rise, rate constant will be 4 time.

So, according to the given information,

At 280 K, the rate constant is 2k .

At 300 K, the rate constant is ( )1 24k k .

So,

1 2

2 1

40.25

k kk k==

60. For exhibiting tautomerism, presence of Hα − atom along

with a multibonded functional group is essential.

So, the above compound exhibits tautomerism.