Q. No. 1 The most stable oxidation states of nitrogen are ...

Q. No. 1 The most stable oxidation states of nitrogen are

Option 1 -3, +3 and +5

Option 2 -3, 0 and -1

Option 3 -3, +3 and 0

Option 4 -3, +3 and -5

Correct Answer 1

Explanation NH3 (-3)k

NaNO2 (+3)

HNO3 (+5)

N2 (0)

Q. No. 2 Nitrogen is an essential constituent of

Option 1 Fats and carbohydrates

Option 2 Carbohydrates and enzymes

Option 3 Proteins and amino acids

Option 4 Vitamin A and vitamin B

Correct Answer 3

Explanation

Proteins are formed by multiple amino acids joined by peptide linkage

Q. No. 3 Which of the following reactions is used in the preparation of N2?

Option 1 2(a) NH Cl+ NaNO

heat4 →

Option 2 3(b) Ca(OCl) + NH

heat2 →

Option 3 (c) (NH ) Cr Oheat

4 2 2 7→

Option 4 All of these

Correct Answer 4

Explanation NH Cl+ NaNO N +NaCl+2H O4 2 2 2→∆

3Ca(OCl) + NH2 →∆

(NH ) Cr O N +Cr O + 4H O4 2 2 7 2 2 3 2→∆

Q. No. 4 Small quantities of very pure N2 is obtained by carefully warming

Option 1 Sodium azide (NaN3)

Option 2 A mixture of CuO and NH3

Option 3 A mixture of NH3 and Br2

Option 4 A mixture of Zn, NaNO3 and NaOH

Correct Answer 1

Explanation NaN 2N +3N3 2 2→ ↑∆

Q. No. 5 Which of the following compounds does not give N2 on heating?

Option 1 KNO3

Option 2 NH4NO2

Option 3 (NH4)2 Cr2O7

Option 4 NaN3

Correct Answer 1

Explanation 1KNO KNO + O

23 2 2→∆

Q. No. 6 Animals die in an atmosphere of nitrogen due to

Option 1 The formation of cyanide ions which block the oxygen-binding site of haemoglobin

Option 2 The formation of isocyanide ions which block the oxygen-binding site of haemoglobin

Option 3 Lack of oxygen

Option 4 None of these

Correct Answer 3

Explanation Factual/conceptual

Q. No. 7 Among the following, the element that does not show allotropy

Option 1 N

Option 2 P

Option 3 As

Option 4 Bi

Correct Answer 4

Explanation Bi

N-(solid)- (ccp)& (hcp)α βα βα βα β

P-(red, black, white)

AS-(grey, yellow, black)

Sb-(metallic, yellow, explosive)

Q. No. 8 Which of the following, exhibits a layered structure?

Option 1 BN

Option 2 N2

Option 3 P4

Option 4 AsH3

Correct Answer 1

Explanation BN-(Inorganic graphite)

N2 – gas

P4 – tetrahedral

ASH3 - pyramidal

Q. No. 9 Which of the following halides of nitrogen is stable?

Option 1 NF3

Option 2 NCl3

Option 3 NBr3

Option 4 NI3

Correct Answer 1

Explanation NF3 - Factual

Q. No. 10 The tendency of nitrogen halides to act as Lewis bases decreases in the order

Option 1 NF NCl NBr NI> > >> > >> > >> > >3 3

Option 2 NI NBr NCl NF> > >> > >> > >> > >3 3 3

Option 3 NF NCl NBr NI≈ > >≈ > >≈ > >≈ > >3 3 3 3

Option 4 NF NCl NBr NI> > ≈> > ≈> > ≈> > ≈3 3 3 3

Correct Answer 2

Explanation Correction

NI NBr NCl NF> > >> > >> > >> > >3 3 3

Which is due to increased electronegativity from I to F

Q. No. 11 N2 is commercially prepared by

Option 1 fractional distillation of liquefied air

Option 2 heating sodium nitrite

Option 3 heating sodium azide

Option 4 heating a mixture of ammonium chloride sodium nitrite

Correct Answer 1

Explanation Factual

Q. No. 12 Which of the following gases is the least reactive?

Option 1 O2

Option 2 N2

Option 3 H2

Option 4 O3

Correct Answer 2

Explanation N2 (Due to high N N≡≡≡≡ bond enthalpy) (945 kJ/mole)

Q. No. 13 The reaction between urea and nitrous acid produces

Option 1 NH3

Option 2 NO2

Option 3 N2O

Option 4 N2

Correct Answer 4

Explanation

Q. No. 14 Calcium carbide on heating with N2 at 11000 C gives

Option 1 hydrolith

Option 2 calcium ammonium nitrate

Option 3 calcium cyanamide

Option 4 nitrolim

Correct Answer 3

Explanation CaC CaCN→→→→N22 20

1100 C Calcium cyanamide

Q. No. 15 The structure of boron nitride resembles that of

Option 1 nickel arsenide

Option 2 graphite

Option 3 rock salt

Option 4 diamond

Correct Answer 2

Explanation BN (Inorganic Graphite)

Q. No. 16 Which of the following properties is not compatible with nitrogen?

Option 1 Hydrogen bonding

Option 2 Catenation

Option 3 Supporter of life

Option 4 Low boiling point

Correct Answer 3

Explanation Factual

Q. No. 17 Which of the following forms strong P -Pπ ππ ππ ππ π bonding

Option 1 P4

Option 2 As4

Option 3 N2

Option 4 Sb4

Correct Answer 3

Explanation N N≡≡≡≡

Q. No. 19 The bond order in the NO molecule is

Option 1 3

Option 2 1.5

Option 3 2.5

Option 4 2.0

Correct Answer 3

Explanation NO: 1S 1S 2S 2S 2 2 2 2 2ppz px py p yσ σ σ σ σ π π π πσ σ σ σ σ π π π πσ σ σ σ σ π π π πσ σ σ σ σ π π π π2 * 2 2 * 2 2 2 2 * 1 *��

yx

B.0 = 10 - 5

2=2.5

Q. No. 20 Which of the following complexes is responsible for the brown colour of the ring

formed in the ring test for the nitrates?

Option 1 [Fe(CN)5NO]3+

Option 2 [Fe(H2O)4NO]2+

NO+

Option 3 [Fe (CN)5NO]2+

Option 4 [Fe (H2O)5NO]2+

Correct Answer 4

Explanation [Fe (H2O)5NO]2+

2NO + 4H SO +6Fe 6Fe +2NO + 4SO + 4H O→ ↑→ ↑→ ↑→ ↑- +2 +3 2-3 2 4 4 2

Fe +5H O+NO [Fe(H O) NO]→→→→+2 +22 2 5

Q. No. 21 N2O3 is

Option 1 an acidic oxide and the anhydride of HNO2

Option 2 an acidic oxide and the anhydride of H2N2O2

Option 3 a neutral oxide and the anhydride of HNO3

Option 4 a basic oxide and the anhydride of HNO2

Correct Answer 1

Explanation N O Acidic oxide→→→→2 3

(N O +H O) 2HNO Nitron Acid)→→→→2 3 2 2

2HNO N O +H O→→→→2 2 3 2

Q. No. 22 Which of the following oxides of nitrogen is a mixed anhydride of two acids?

Option 1 N2O3

Option 2 N2O4

Option 3 N2O5

Option 4 NO2

Correct Answer 2

Explanation N O HNO +HNO→→→→H O22 4 2 3

Q. No. 23 Liquid N2O4 self-ionizes as

Option 1 N O (l) NO +NO+ -

2 4 2 2� ��

Option 2 2N O (l) NO + 2NO +NO- +

2 4 3 2� ��

Option 3 N O (l) NO + 2NO+ -

2 4 3� ��

Option 4 N O (l) 2NO2 4 2� ��

Correct Answer 3

Explanation N O NO + 2NO+ -

2 4 3� ��

Q. No. 24 NH4NO2 on heating gives

Option 1 N2O

Option 2 HNO3

Option 3 N2

Option 4 N2H4

Correct Answer 3

Explanation NH NO N +2H O→→→→4 2 2 2

Q. No. 25 Pure nitric acid is a colourless liquid, but on exposure to light it turns brownish due to

Option 1 Slight decomposition of HNO3 into O2

Option 2 Slight decomposition of HNO3 into NO2 and O2

Option 3 The formation of N2O

Option 4 The formation of H3O+ and NO

-3

Correct Answer 2

Explanation

Q. No. 26 At present, HNO3 is industrially prepared by the

Option 1 Contact process

Option 2 Birkeland-Eyde process

Option 3 Ostwald process

Option 4 Haber process

Correct Answer 3

Explanation Factual

Q. No. 27 Phosphorus reacts with concentrated HNO3 to produce

Option 1 Hypophosphoric acid

Option 2 Orthophosphrous acid

Option 3 Pyrophosphoric acid

Option 4 Orthophosphoric acid

Correct Answer 4

Explanation P +20HNO 4H PO +20NO + 4H O→→→→4 3 3 4 2 2Orthophosphoric acid

Q. No. 28 Iodine reacts with concentrated HNO3 to produce

Option 1 H5IO6

Option 2 HIO4

Option 3 HIO3

Option 4 HIO

Correct Answer 3

Explanation I +10HNO 2HIO +10NO + 4H O→→→→2 3 3 2 2

Q. No. 29 Gold reacts with aqua regia forming

Option 1 Auric chloride (AuCl3)

Option 2 Chloroauric acid (HAuCl4)

Option 3 Chloroaurous acid (HAuCl3)

Option 4 Purple of Cassius

Correct Answer 2

Explanation Au+HNO +HCl HAuCl +NO +2H O3 4 2��

Q. No. 30 Platinum reacts with aqua regia to produce chloroplatinic acid represented by the

formula

Option 1 H4[PtCl6]

Option 2 H[PtCl4]

Option 3 H2[PtCl6]

Option 4 H2[PtCl4]

Correct Answer 3

Explanation Pt + 4NO + 8H Pt + 4NO + 4H O→→→→- + +43 2 2

Pt + 6Cl PtCl→→→→+4 - 2-6

PtCl +2H H PtCl→→→→2- +2 6

Q. No. 31 TNT is detonated by mixing it with

Option 1 NH4Cl

Option 2 NH4NO2

Option 3 NH4NO3

Option 4 (NH4)2SO4

Correct Answer 3

Explanation Amatol NH NO + TNT→→→→ 4 3(explosive) Ammonium

Nitrate

Q. No. 32 When AgNO3 is heated strongly above 8000C, it produces

Option 1 Ag2O, NO and NO2

Option 2 Ag, NO2 and O2

Option 3 Ag2O, NO2 and O2

Option 4 Ag, NO and O2

Correct Answer 2

Explanation 2AgNO 2Ag + O +2NO→→→→3 2 2

Q. No. 33 Which of the following compounds does not form ammonia on heating?

Option 1 (NH4)2SO4

Option 2 NH4Cl

Option 3 (NH4)2CO3

Option 4 NH4NO2

Correct Answer 4

Explanation NH NO N +2H O→→→→4 2 2 2

Q. No. 34 Which one of the following compound is most explosive?

Option 1 NCl3

Option 2 PCl3

Option 3 AsCl3

Option 4 NF3

Correct Answer 1

Explanation Factual

Q. No. 35 Among the following compounds of nitrogen and hydrogen, the most acidic compound

is

Option 1 NH3

Option 2 N2H4

Option 3 N2H2

Option 4 HN3

Correct Answer 4

Explanation HN H +N→→→→ + -3 3

Hydrozoic acid

Q. No. 36 An aqueous solution of ammonia consists of

Option 1 H+

Option 2 OH-

Option 3 NH3 and OH-

Option 4 NH-3 and OH

-

Correct Answer 4

Explanation NH +H O NH OH→→→→3 2 4 (aq)

Q. No. 37 Which of the following fertilizers on repeated application would increase the acidity of

the soil?

Option 1 Urea

Option 2 Potassium nitrate

Option 3 Superphosphate of lime

Option 4 Ammonium sulphate

Correct Answer 4

Explanation Ammonium sulphate (NH4)2SO4 is used as a fertilizer for alkaline soil. Oxides

consumption causes acidity.

Q. No. 38 The starting material in the Birkeland-Eyde process for the manufacture of nitric acid is

Option 1 NH3

Option 2 NO2

Option 3 Air

Option 4 Chile saltpetre

Correct Answer 3

Explanation air 2NO 2NO 2HNO +NO→ → →→ → →→ → →→ → →O H Oelectrical 2 22 3discharge

Q. No. 39 Ammonia has can be dried by

Option 1 Conc. H2SO4

Option 2 P4O10

Option 3 Anhydrous CaCl2

Option 4 None of these

Correct Answer 3

Explanation Conc. H2SO4 , P4O10 oxidize ammonia, but anhydrous CaCl2 is just for drying

Q. No. 40 A solution of sodium in liquid ammonia is blue due to the presence of

Option 1 Solvated electrons

Option 2 Ammonium ions

Option 3 Solvated sodium ions

Option 4 Sodium atoms

Correct Answer 1

Explanation Sodium dissolves in ammonia without dissolution of hydrogen, colour of solution is

blue. Metal atom loses electron & combines with ammonia molecule

M M (in liq. ammonia)+e (ammoniated)→→→→ + -

M +(x + y)NH [M(NH )x] +e(NH )y→→→→ +3 3 3

Solvated e- responsible for colour.

Q. No. 41 Which of the following statement is correct?

Option 1 Phosphorus does not form p -pπ ππ ππ ππ π multiple bonds in its compounds

Option 2 Phosphorus forms weak to moderate d -pπ ππ ππ ππ π multiple bonds in some of its

compounds.

Option 3 Phosphorus can expand its valence shell by utilizing inner 3d orbitals.


Correct Answer 4

Explanation All are true

Because p -pπ ππ ππ ππ π overlap is very weak in phosphorus

Q. No. 42 Phosphorus is obtained by

Option 1 Reducing phosphate rock with coke at a high temperature in the presence of silica in

an electric furnace

Option 2 Reducing phosphate rock with sulphur and alumina

Option 3 Reducing phosphate rock with silica and iron oxide in an electric furnace

Option 4 Reducing phosphatic fertilizers with boron and alumina in an electric furnace

Correct Answer 1

Explanation Factual

2Ca (PO ) + 6SiO +10C 6CaSiO +10CO+P→→→→3 4 2 2 3 4

Q. No. 43 White phosphorus is kept under

Option 1 Kerosene oil

Option 2 Water

Option 3 Concentrated HNO3

Option 4 ethanol

Correct Answer 2

Explanation As white phosphorus has low ignition temperature (300C). It readily caches fire giving

dense fumes of phosphorus pentaoxide .Its therefore, kept in water.

P + SO P O→→→→4 2 4 10

Q. No. 44 White phosphorus is more reactive than N2 because

Option 1 Electronegativity of phosphorus is low

Option 2 Ionization energy of phosphorus is low

Option 3 bond is weaker than P N N bond- P ≡≡≡≡

Option 4 bond is polymP- P eric

Correct Answer 3

Explanation Self-explanatory statement

Q. No. 45 The most stable allotropic form of phosphorus is

Option 1 Yellow P

Option 2 Red P

Option 3 Scarlet P

Option 4 Black P

Correct Answer 4

Explanation Factual

Q. No. 46 Which of the following forms of phosphorus has a graphite like structure and is a good

conductor of electricity?

Option 1 Black phosphorus

Option 2 White phosphorus

Option 3 Red phosphorus

Option 4 Scarlet phosphorus

Correct Answer 1

Explanation Factual

Q. No. 47 Which one of the following is not an ore of phosphorus?

Option 1 Malachite

Option 2 Fluorapatite

Option 3 Chlorapatite

Option 4 phosphorite

Correct Answer 1

Explanation Malachite CuCO3 . Cu(OH)2

Fluorapatite 3Ca3(PO4)2 . CaF2

Chlorapatite 3Ca3(po4)2 . CaCl2

Phosphorite Ca3(PO4)2

Q. No. 48 Red phosphorus is less reactive than white phosphorus because

Option 1 The P - P bond length is greater in red phosphorus

Option 2 Red P has a polymeric structure

Option 3 Red P is held by weak van der Waals forces

Option 4 Red P has greater tendency to act as a donor

Correct Answer 2

Explanation

Q. No. 49 Which of the following statement is correct regarding the behaviour of white

phosphorous?

Option 1 It is soft, waxy and reactive

Option 2 It reacts with moist air to emit a light called chemiluminescence

Option 3 It exists as tetrahedral P4 molecules both in the liquid and gaseous states.

Option 4 All the above

Correct Answer 4

Explanation All are factual statements

Q. No. 50 White phosphorus reacts with NaOH to give PH3 and NaH2PO2. This reaction involves

Option 1 Oxidation

Option 2 Reduction

Option 3 Disproportionation

Option 4 neutralization

Correct Answer 3

Explanation P + 3NaOH+ 3H O 3NaH PO +PH→ ↑→ ↑→ ↑→ ↑4 2 2 2 3ndisprop +1 -3

Q. No. 51 White phosphorous reacts with concentrated HNO3 to give

Option 1 Orthophosphoric acid

Option 2 Pyrophosphoric acid

Option 3 Phosphorus acid

Option 4 Metaphosphoric acid

Correct Answer 1

Explanation P + 20HNO 4H PO +20NO + 4H O→→→→4 3 3 4 2 2ortophosphoric acid

Q. No. 52 White phosphorus reacts with calcium to give a certain compound. This compound on

hydrolysis produces

Option 1 P2H4

Option 2 PH3

Option 3 P2

Option 4 P4O10

Correct Answer 2

Explanation 6Ca + P 2Ca P 6Ca(OH) + 2PH→ →→ →→ →→ →H O24 3 2 2 3

Q. No. 53 PCl5 on hydrolysis gives

Option 1 H3PO2

Option 2 H3PO3

Option 3 H3PO4

Option 4 H5P3O10

Correct Answer 3

Explanation PCl +H O POCl + 2HCl

4H O

H PO + 5HCl

→→→→

↓↓↓↓

5 2 3

2

3 4

Q. No. 54 Solid PCl5 exists as

Option 1 [PCl4]+ and [PCl6]

- ions

Option 2 [PCl4]- and [PCl6]

+ ions

Option 3 Covalent PCl5 molecules only

Option 4 [PCl4]2+

and [PCl6]2-

ions

Correct Answer 1

Explanation 2PCl [PCl ] [PCl ]→→→→ + -5 4 6

Q. No. 55 Syrupy H3PO4 is viscous due to

Option 1 Intermolecular hydrogen bonding

Option 2 Van der Waals forces among the H3PO4 molecules

Option 3 Covalent bonding in P- O linkage

Option 4 Low activation energy in H3PO4

Correct Answer 1

Explanation Factual

Q. No. 56 Which of the following statement is true for the H3PO3 molecule?

Option 1 It contains two acidic H atoms

Option 2 It contains one reducing H atom

Option 3 It can form two series of salts


Correct Answer 4

Explanation

Q. No. 57 Which of the following structures represents hypophosphoric acid?

Option 1

Option 2

Option 3

Option 4

Correct Answer 3

Explanation

Q. No. 58 Which of the following halides is the most acidic?

Option 1 PCl5

Option 2 SbCl3

Option 3 BiCl3

Option 4 CCl4

Correct Answer 3

Explanation Acidity of halides increases down the group

Q. No. 59 Which of the following oxoacids of phosphorus is a reducing agent and a monobasic

acid as well?

Option 1 Orthophosphorus acid (H3PO3)

Option 2 Hypophosphorus acid (H3PO2)

Option 3 Pyrophosphorus acid (H4P2O5)

Option 4 Metaphosphorus acid (HPO3)

Correct Answer 2

Explanation

Q. No. 60 The number of P - O - P bonds in cyclic metaphosphoric acid is

Option 1 Zero

Option 2 Two

Option 3 Three

Option 4 four

Correct Answer 3

Explanation

Q. No. 61 In ozone, the central oxygen atoms uses

Option 1 Roughly sp2 orbitals for σσσσ bonding

Option 2 Sp orbitals for ππππ bonding only

Option 3 sp3 orbitals for σσσσ bonding

Option 4 pd2z Bonding for both σσσσ and ππππ bonding

Correct Answer 1

Explanation

Q. No. 62 Ozone is prepared by the action of silent electric discharge upon oxygen in an

apparatus called ozonizer. The reaction

Option 1 Is exothermic

Option 2 Is endothermic

Option 3 Leads to the dissociation of the O2 molecule

Option 4 Leads to the formation of O+2

Correct Answer 2

Explanation As O3 is not stable

Q. No. 63 Ozonized oxygen is a mixture of

Option 1 O3 and N2

Option 2 O3 and O-2

Option 3 O3 and O2

Option 4 O3 and Cl2

Correct Answer 3

Explanation Factual

Q. No. 64 Which of the following statement is correct?

Option 1 Ozone decomposes to give oxygen

Option 2 Ozone is thermodynamically unstable

Option 3 The decomposition of ozone is exothermic


Correct Answer 4

Explanation All are factual

Q. No. 65 Ozone is extremely powerful oxidising agent. It is

Option 1 Second only to F2 in oxidizing power

Option 2 Second only to O2 in oxidizing power

Option 3 Second only to Cl2 in oxidizing power

Option 4 Second only to MnO-4 in oxidizing power

Correct Answer 1

Explanation F O MnO Cl> > >> > >> > >> > >-2 3 4 2

2.87 2.0757 1.70 1.36 (Red potential)> > >> > >> > >> > > n

Q. No. 66 At room temperature, O3 is absorbed by

Option 1 Water

Option 2 Palladium

Option 3 Acetic acid

Option 4 Turpentine oil

Correct Answer 4

Explanation Factual

Q. No. 67 The gases observed by alkaline pyrogallol and oil of cinnamon are respectively

Option 1 O3 and CH4

Option 2 O2 and O3

Option 3 SO2 and CH4

Option 4 N2O and O3

Correct Answer 2

Explanation Factual

Q. No. 68 In the presence of water, sulphur is oxidized by ozone to give

Option 1 H2SO3

Option 2 SO2

Option 3 H2SO4

Option 4 SO3

Correct Answer 3

Explanation S +H O + 3O H SO + 3O→→→→2 3 2 4 2

Q. No. 69 O3 is

Option 1 An allotrope of oxygen

Option 2 An isomer of oxygen

Option 3 An isotone of oxygen

Option 4 Isostructural with O2

Correct Answer 1

Explanation Conceptual

Q. No. 70 Which of the following compounds produces holes In the ozone layer in the upper

atmosphere?

Option 1 Ammonia

Option 2 Freons

Option 3 Carbon dioxide

Option 4 Nitrogen

Correct Answer 2

Explanation Factual

Q. No. 71 Group 16 elements (except polonium) are called chalcogens because

Option 1 These elements particularly sulphur and oxygen, are present in many metallic ores

mainly as oxides and sulphides

Option 2 A large number of acids contain these elements, particularly sulphur and oxygen

Option 3 These elements mainly form anions

Option 4 These elements exist in different allotropic forms

Correct Answer 1

Explanation Factual

Q. No. 72 In the cyclo-S8 molecule of rhombic sulphur, all the S - S bond lengths and all S - S - S

bond angles are respectively (approximate values)

Option 1 204 pm and 1050




Correct Answer 1

Explanation

Q. No. 74 Pure H2S is prepared by the action of concentrated HCl on

Option 1 Sb2S3

Option 2 FeS

Option 3 Ag2S

Option 4 FeS2

Correct Answer 1

Explanation Factual

Sb S + 6HCl 2SbCl + 3H S→→→→2 3 3 2

Q. No. 75 The stability of the hydrides of oxygen, sulphur, selenium and tellurium decreases in

the order

Option 1 H Te H Se H S H O2 2 2 2> > >

Option 2 H O H S H Se H Te2 2 2 2> > >

Option 3 H O H S H Se H Te2 2 2 2> < >

Option 4 H O H S H Te H Se≈≈≈≈2 2 2 2> >

Correct Answer 2

Explanation H O H S H Se H Te2 2 2 2> > >

Due to decrease in bond-dissociation energy down the group.

Q. No. 76 Which of the following reagents turns lead acetate paper black?

Option 1 SO2

Option 2 H2SO4

Option 3 K2CrO4

Option 4 H2S

Correct Answer 4

Explanation Pb +H S PbS (black)→→→→2

Characteristic test for sulphides

Q. No. 77 H2S turns an acidified K2Cr2O7 solution

Option 1 Violet

Option 2 Orange

Option 3 Green

Option 4 Colourless

Correct Answer 3

Explanation 3H S +K Cr O + 4H SO K SO + Cr (SO ) + 7H O + 3S→ ↓→ ↓→ ↓→ ↓2 2 2 7 2 4 2 4 2 4 3 2ColourlessOrange Green

Q. No. 78 H2S turns an acidified KMnO4 solution

Option 1 Green

Option 2 Pink

Option 3 Blue-black

Option 4 colourless

Correct Answer 4

Explanation 2KMnO + 3H SO + 5H S K SO +2MnSO + 8H O + 5S→ ↓→ ↓→ ↓→ ↓4 2 4 2 2 4 4 2dark violet Colourless

Q. No. 79 Which of the following compound is thermodynamically unstable?

Option 1 H2O

Option 2 H2Se

Option 3 H2S

Option 4 NH3

Correct Answer 2

Explanation H O H S H Se H Te2 2 2 2> > >

Due to decrease in bond-dissociation energy down the group.

Q. No. 80 H2S is less stable than H2O because

Option 1 The bonding orbitals of sulphur are larger and more diffuse than those of oxygen, and

hence they overlap less effectively with the 1 s orbital of the hydrogen atom

Option 2 The bonding orbitals of sulphur are smaller and more diffuse than those of oxygen,

and hence they overlap less effectively with the 1 s orbital of the hydrogen atom

Option 3 The bonding orbitals of sulphur are smaller and less diffuse than those of oxygen, and

hence they overlap less effectively with the 1 s orbital of the hydrogen atom

Option 4 H2O molecules from H bonds but H2S molecules do not

Correct Answer 1

Explanation Conceptual, self-explanatory statement

Q. No. 81 Sulphur dioxide reacts with chlorine in the presence of charcoal (which acts as a

catalyst) to give

Option 1 Sulphuryl chloride

Option 2 Thionyl chloride

Option 3 Sulphur dichloride and oxygen

Option 4 Chlorine monoxide and sulphur

Correct Answer 1

Explanation SO + Cl SO Cl (Sulphuryl chloride)→→→→charcoal2 2 2 2catalysis

Q. No. 82 Which of the following gases may act both as an oxidizing

Option 1 H2S

Option 2 SO3

Option 3 SO2

Option 4 O2

Correct Answer 3

Explanation

H S only reducing→→→→2

SO only oxidizing→→→→3

O only oxidizing (mostly, except F , etc )→→→→2 2

Q. No. 83 Dehydration of concentrated H2SO4 in the presence of P4O10 produces

Option 1 SO2

Option 2 H2S

Option 3 O2

Option 4 SO3

Correct Answer 4

Explanation 2H SO +P O 4HPO +2SO→→→→2 4 4 10 3 3

Q. No. 84 Na2SO3 on being heated with sulphur produces

Option 1 Na2S2O3

Option 2 Na2S4O6

Option 3 Na2SO4

Option 4 Na2S5

Correct Answer 1

Explanation Na SO + S Na S O→→→→2 3 2 2 3

Q. No. 85 H2SO4 is manufactured from SO2(g) by the

Option 1 Hall process

Option 2 Contact process

Option 3 Rasching process

Option 4 Haber process

Correct Answer 2

Explanation Factual

Q. No. 86 Which of the following ions does not have an S - S linkage?

Option 1 S2O82-

Option 2 S2O62-

Option 3 S2O52-

Option 4 S2O32-

Correct Answer 1

Explanation

Q. No. 87 When SO2 gas is passed into an acidified solution of K2Cr2O7, the oxidation state of

chromium changes

Option 1 From +12 to +6




Correct Answer 3

Explanation K Cr O + 3SO +H SO K SO + Cr (SO ) +H O→→→→2 2 7 2 2 4 2 4 2 4 3 2+6 +3

Q. No. 88 Standard sodium thiosulphate solution is used in the estimation of iodine present in a

solution. The equivalent weight of sodium thiosulphate which is required to make the

standard solution is

Option 1 (molecular weight)/2


Option 3 The same as he molecular weight


Correct Answer 3

Explanation 2Na S O +I 2NaI+Na S O→→→→2 2 3 2 2 4 6

Q. No. 89 A gas that cannot be collected over water is

Option 1 N2

Option 2 O2

Option 3 SO2

Option 4 PH3

Correct Answer 3

Explanation SO + H O H SO→→→→2 2 2 3Sulphurous acid

Rest don’t react with H2O

Q. No. 90 When H2S gas is passed into aqueous sulphur dioxide

Option 1 A clear solution of H2SO4 is formed

Option 2 SO2 is converted into a yellow precipitate of sulphur

Option 3 H2S is converted into a yellow precipitate of sulphur

Option 4 Both SO2 and H2S are converted into a yellow precipitate of sulphur

Correct Answer 4

Explanation 2H S + SO 2H O + 3S→→→→2 2 2

Q. No. 91 Which of the following elements can have both positive and negative oxidation states?

Option 1 Fluorine

Option 2 Iodine

Option 3 Lithium

Option 4 Helium

Correct Answer 2

Explanation HI (-1)

HIO4 (+7)

Q. No. 92 Which of the following halogens has only one oxidation state of – 1 in a aqueous

solution?

Option 1 Iodine

Option 2 Chlorine

Option 3 Bromine

Option 4 Fluorine

Correct Answer 4

Explanation F F only→→→→ -

Q. No. 93 Which one among following is the most powerful oxidizing agent?

Option 1 Cl2

Option 2 Br2

Option 3 F2

Option 4 I2

Correct Answer 3

Explanation F + 2e 2F (2.87)v→→→→- -2

Q. No. 94 All the halogens are coloured. The colours arise due to

Option 1 Weak van der Waals forces between the halogen molecules

Option 2 Strong oxidizing power of the halogens

Option 3 Absorption of light which causes an electron to jump from the ground state to a higher

state

Option 4 Emission of light due to transfer of an electron from a higher state to the ground state

Correct Answer 3


Q. No. 95 Which of the following statements is correct for the iodine molecule?

Option 1 In liquid state it conducts electricity, though very slightly, due to self-ionization:

3I I + I+ -

2 3 3��

Option 2 Its conductivity increases with the rise in temperature

Option 3 It behaves like an intrinsic semiconductor

Option 4 All the above

Correct Answer 4

Explanation All are factual statements

Q. No. 96 Which of the following is arranged in order of increasing bond energy?

Option 1 I Br Cl F2 2 2 2< < <

Option 2 I F Br Cl2 2 2 2< < <

Option 3 I Br F Cl2 2 2 2< < <

Option 4 Cl Br F I2 2 2 2< < <

Correct Answer 2

Explanation Cl Br F I

↑ ↑ ↑ ↑

2 2 2 2> > >

exceptional

Due to high e- repulsion between non-bonding e

- in 2p-orbitals of fluorine

Q. No. 97 Which of the following are not correctly matched?

Option 1 A halogen which is a liquid at room temperature →→→→ bromine

Option 2 The most electronegative element →→→→ fluorine

Option 3 The strongest oxidizing halogen →→→→ iodine

Option 4 The most reactive halogen →→→→ fluorine

Correct Answer 3

Explanation The strongest oxidizing halogen →→→→ fluorine, not iodine

Q. No. 98 Which of the following halide ions the most basic?

Option 1 F-

Option 2 Cl-

Option 3 Br-

Option 4 I-

Correct Answer 1

Explanation HF HCl HBr HI (Acidity)

F Cl Br I (Basicity)- - - -

< < <

> > >

Q. No. 99 One of the reason why F -F bond is weak is that

Option 1 The repulsion between the nonbonding pairs of electrons of the two fluorine atoms is

high

Option 2 The ionization energy of the fluorine atom is very high

Option 3 The F -F bond distance is large

Option 4 The F -F bond distance Is small and hence internuclear repulsion is small

Correct Answer 1

Explanation Cl Br F I

↑ ↑ ↑ ↑

2 2 2 2> > >

exceptional

Due to high e- repulsion between non-bonding e

- in 2p-orbitals of fluorine

Q. No. 100 In spite of having lower dissociation energies, bromine and iodine are weaker oxidizing

agents than chlorine due to their

Option 1 Smaller electron affinities and greater hydration energies

Option 2 Smaller electron affinities and smaller hydration energies

Option 3 Greater electron affinities and greater hydration energies

Option 4 Greater electron affinities and smaller hydration energies

Correct Answer 2


Q. No. 102 PtF6 converts O2 to

Option 1 O PtF- +2 6

Option 2 O PtF+ -2 6

Option 3 F +PtO2 2

Option 4 F O +Pt2

Correct Answer 2

Explanation O + PtF O PtF (Bartlett rxn)→→→→ + -2 6 2 6

Q. No. 103 Fluorine was first prepared by

Option 1 Electrolysis of hydrogen fluoride

Option 2 Electrolysis of fused KF

Option 3 Electrolysis of a solution of KHF2 in HF

Option 4 Electrolysis of molten cryolite

Correct Answer 3

Explanation Factual

Q. No. 104 Which of the following reactions may be used for the preparation of chlorine?

Option 1 KMnO + HCl(conc.) →→→→4

Option 2 NaCl+MnO +H SO (conc.) →→→→2 2 4

Option 3 Ca(OCl)Cl+H O →→→→2


Correct Answer 4

Explanation 2KMnO +16HCl 2KCl+ 2MnCl + 8H O + 5Cl→→→→4 2 2 2

2NaCl+ MnO + 3H SO 2NaHSO +MnSO + 2H O + Cl→→→→2 2 4 4 4 2 2

CaOCl +H O CaO +H O + Cl→→→→2 2 2 2

Q. No. 105 Pyrolusite on heating with concentrated Cl2(g). This process is known as

Option 1 Weldon process

Option 2 Deacon process

Option 3 Beckmann process

Option 4 Mond process

Correct Answer 1

Explanation Factual

Q. No. 106 Chlorine is manufactured by oxidizing HCl(g) with O2 at 4000C in the presence of CuCl

catalyst. This process is known as

Option 1 Leblanc process

Option 2 Solvay process

Option 3 Dennis process

Option 4 Deacon process

Correct Answer 4

Explanation Factual

Q. No. 107 Fluorine reacts with water to produce

Option 1 HF, O2 and O3

Option 2 HF and O2

Option 3 HF and OF2

Option 4 HF and O3

Correct Answer 1

Explanation 5F + 5H O 10HF + O + O→→→→2 2 2 3

Q. No. 108 Chlorine reacts with dilute NaOH under ordinary conditions to give

Option 1 NaCl and NaClO3

Option 2 NaCl and ClO2

Option 3 NaCl and NaClO

Option 4 NaCl and Cl2O

Correct Answer 3

Explanation 2NaOH + Cl NaCl +NaClO +H O→→→→2 2(Cold & dilute)

Q. No. 109 Chlorine on reaction with hot and concentrated NaOH produces

Option 1 NaClO3 and NaClO



Option 4 NaClO3 and NaClO4

Correct Answer 2

Explanation 6NaOH + 3Cl 5NaCl +NaClO + 3H O→→→→2 3 2(Hot & conc.)

Q. No. 110 Dry SO2 reacts with Cl2 to produce

Option 1 S2Cl2

Option 2 SOCl2

Option 3 S(OCl)2

Option 4 Cl.O2.Cl

Correct Answer 3

Explanation SO + Cl SO Cl→→→→dry2 2 2 2

(dry)

Q. No. 111 When SO2 gas is passed into chlorine water, the products formed are

Option 1 SCl2 and S2Cl2

Option 2 H2SO4 and HCl

Option 3 SO2Cl2

Option 4 SOCl2 and HCl

Correct Answer 2

Explanation SO + 2H O + Cl H SO +2HCl→→→→2 2 2 2 4Chlorine water

Q. No. 112 Bromine can be liberated from KBr by the action of

Option 1 Iodine solution

Option 2 Chlorine water

Option 3 Sodium chloride

Option 4 Potassium iodide

Correct Answer 2

Explanation 2KBr + Cl 2KCl+Br→→→→2 2

Q. No. 113 Which of the following products is formed when a mixture of solid NaCl and solid

K2Cr2O7 (in excess) is heated with concentrated H2SO4?

Option 1 H2CrO4

Option 2 Cr2(SO4)3

Option 3 CrCl3

Option 4 CrO2Cl2

Correct Answer 4

Explanation (Chronyl chloride test)

NaCl+ conc. H SO NaHSO +HCl→→→→2 4 4

K Cr O + 2 H SO 2KHSO + 2CrO +H O→→→→2 2 7 2 4 4 3 2

CrO + 2 HCl CrO Cl + 2H O→→→→3 2 2 2

Q. No. 114 Sodium thiosulphate reacts with iodine to give

Option 1 SO2-4

Option 2 SO2-3

Option 3 S O2-

4 6

Option 4 S2-

Correct Answer 3

Explanation 2Na S O +I 2NaI+Na S O→→→→2 2 3 2 2 4 6

Q. No. 115 Concentrated HNO3 reacts with iodine to give

Option 1 HI

Option 2 HOIO2

Option 3 HOI

Option 4 HOIO3

Correct Answer 2

Explanation I +10 HNO 2HIO +10NO + 4H O→→→→2 3 3 2 2

Q. No. 116 SiO2 reacts with HF to produce

Option 1 SiF4 and H2O

Option 2 Si and HFO2

Option 3 SiF6 and H2O

Option 4 H2[SiF6] and H2O

Correct Answer 4

Explanation SiO + 6HF H [SiF ]+ 2H O→→→→2 2 6 2

Q. No. 118 When iodine is treated with a mixture of NaF, NaBr and NaCl in water , it gives

Option 1 A mixture of F2, Cl2 and Br2

Option 2 Cl2

Option 3 Br2

Option 4 No reaction

Correct Answer 4

Explanation As I2 is the strongest reducing agent of F2, Br2 & Cl2 so it cant oxidize

F F Cl Cl Br Br→ → →→ → →→ → →→ → →- - -2 2 2X X X

Q. No. 119 Which of the following oxides of chlorine is obtained by passing dry chlorine over silver

chlorate at 900C?

Option 1 Cl2O

Option 2 ClO3

Option 3 ClO2

Option 4 ClO4

Correct Answer 3

Explanation 2AgClO + Cl (dry) 2AgCl + 2ClO + O→→→→3 2 2 2

Q. No. 120 Which of the following statements is not appropriate regarding the characteristics of

interhalogen compound?

Option 1 They are usually less reactive than halogens (except fluorine)

Option 2 They are not so stable, but none of them is explosive

Option 3 They are covalent in nature

Option 4 They have low boiling points and are highly volatile

Correct Answer 1

Explanation Factual, as A -B interhalogen (A & B, Halogens) bonds are weaker than A -B and B -B

bonds.

CIF BrF IF BrF IF BrF (reactivity)3 5 7 3 5> > > > >

Q. No. 121 The element which has the highest first ionization energy is

Option 1 Hydrogen

Option 2 Xenon

Option 3 Fluorine

Option 4 Helium

Correct Answer 4

Explanation Helium

Q. No. 122 Which of the following forms the least number of compounds?

Option 1 Helium

Option 2 Argon

Option 3 Krypton

Option 4 Xenon

Correct Answer 4

Explanation Helium–O compounds

Q. No. 123 Which of the following noble gases is used for cryogenic works?

Option 1 Neon

Option 2 Krypton

Option 3 Helium

Option 4 argon

Correct Answer 3

Explanation As Helium has the lowest m.p. of any element (4.2 K)

Q. No. 124 The interaction of Xe and PtF6 gives

Option 1 XeF4 and PtF2

Option 2 Pt and XeF6

Option 3 XePtF6

Option 4 XeF2 and PtF4

Correct Answer 3

Explanation XePtF6

Xe +PtF XePtF→→→→6 6

Q. No. 125 XeF4 reacts violently with water to give

Option 1 Xe and O2

Option 2 XeOF4

Option 3 Xe, O3 and HF

Option 4 XeO3, O2 and HF

Correct Answer 4

Explanation 2XeF + 3H O Xe + XeO + 3H F +F→→→→4 2 3 2 2 2

Q. No. 126 Noble gases are difficult to liquefy because their

Option 1 Dispersion forces are large

Option 2 Dispersion forces are small

Option 3 Ionization energies are low

Option 4 Electron affinities are high

Correct Answer 2


Q. No. 127 Xenon trioxide (XeO3) has a shape of a

Option 1 Trigonal bipyramid

Option 2 Octahedron

Option 3 Pyramid

Option 4 Tetrahedron

Correct Answer 3

Explanation

Q. No. 128 Which of the following noble gases is the least polarization?

Option 1 He

Option 2 Ar

Option 3 Ne

Option 4 Xe

Correct Answer 1

Explanation Conceptual (very small in size)

Q. No. 129 The structure of XeO3F2 is

Option 1 Square pyramidal

Option 2 Pentagonal bipyramidal

Option 3 Trigonal bipyramidal

Option 4 Octahedral

Correct Answer 3

Explanation Trigonal bipyramidal

Q. No. 130 For breathing, deep-sea divers use a mixture of

Option 1 O2 and H2

Option 2 O2 and N2

Option 3 O2 and He

Option 4 O2 and Ar

Correct Answer 3

Explanation Factual

Q. No. 1 The most stable oxidation states of nitrogen are ...

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