CBSE Class 9 Chemistry Chemistry of Nitrogen and Halogens MCQs Set 12

Chemistry Objective Questions and Answers: Chemistry of Nitrogen and Halogens

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Multiple Choice Questions

Question 1: The compound which gives nitrogen on heating is
(a) \( NH_4NO_3 \)
(b) \( (NH_4)_2SO_4 \)
(c) \( (NH_4)_2CO_3 \)
(d) \( (NH_4)_2Cr_2O_7 \)
Show Answer & Explanation

Answer: (d) \( (NH_4)_2Cr_2O_7 \)

Explanation:
1. \( (NH_4)_2Cr_2O_7\to N_2+Cr_2O_3+4H_2O \).
2. Ammonium nitrate gives \( N_2O \), sulphate and carbonate give ammonia.

Teacher's Note:
1. Ammonium dichromate volcano reaction.

Question 2: A nitrate which leaves no residue on heating is
(a) ammonium nitrate
(b) sodium nitrate
(c) copper nitrate
(d) silver nitrate
Show Answer & Explanation

Answer: (a) ammonium nitrate

Explanation:
1. \( NH_4NO_3\to N_2O+2H_2O \) gives only gases and vapour.
2. The others leave a nitrite or an oxide or the metal.

Teacher's Note:
1. All products are gaseous.

Question 3: A metal which does not give a nitrate with concentrated nitric acid is
(a) zinc
(b) tin
(c) silver
(d) mercury
Show Answer & Explanation

Answer: (b) tin

Explanation:
1. Tin is oxidised to hydrated metastannic acid, not a nitrate.
2. Zinc, silver and mercury form nitrates.

Teacher's Note:
1. Tin gives an insoluble oxide.

Question 4: Nitrous oxide is NOT evolved when
(a) ammonium nitrate is heated
(b) zinc is treated with dilute nitric acid
(c) aluminium foil is boiled with sodium hydroxide and sodium nitrate
(d) hyponitrous acid is heated
Show Answer & Explanation

Answer: (c) aluminium foil is boiled with sodium hydroxide and sodium nitrate

Explanation:
1. Aluminium with NaOH and nitrate gives ammonia (nitrate is reduced all the way to \( NH_3 \)).
2. The other three produce \( N_2O \).

Teacher's Note:
1. Strong reduction gives ammonia.

Question 5: Chlorine does not oxidise
(a) hydrogen sulphide
(b) stannous ions
(c) sulphurous acid
(d) ferric ions
Show Answer & Explanation

Answer: (d) ferric ions

Explanation:
1. Iron in \( Fe^{3+} \) is already in the highest common oxidation state.
2. Chlorine oxidises the other three.

Teacher's Note:
1. No higher state available.

Question 6: The nitrate which gives a colourless gas on heating is
(a) sodium nitrate
(b) silver nitrate
(c) lead nitrate
(d) copper nitrate
Show Answer & Explanation

Answer: (a) sodium nitrate

Explanation:
1. \( 2NaNO_3\to2NaNO_2+O_2 \) gives colourless oxygen.
2. The others give brown \( NO_2 \).

Teacher's Note:
1. Alkali metal nitrates give oxygen only.

Question 7: A white solid decrepitates on heating, gives off a brown gas and leaves a residue that is red when hot and yellow when cold. The solid is
(a) sodium nitrate
(b) lead nitrate
(c) potassium nitrate
(d) ammonium nitrate
Show Answer & Explanation

Answer: (b) lead nitrate

Explanation:
1. \( 2Pb(NO_3)_2\to2PbO+4NO_2+O_2 \); \( NO_2 \) is brown.
2. \( PbO \) is reddish-brown when hot and yellow when cold.

Teacher's Note:
1. Residue colour is the clue.

Question 8: A metallic chloride which turns black with ammonia solution is
(a) lead chloride
(b) silver chloride
(c) mercurous chloride
(d) mercuric chloride
Show Answer & Explanation

Answer: (c) mercurous chloride

Explanation:
1. \( Hg_2Cl_2 \) with ammonia gives a black mixture of mercury and mercury amino-chloride.

Teacher's Note:
1. Calomel test.

Question 9: Heating a mixture of sodium chloride, potassium dichromate and concentrated sulphuric acid gives
(a) chromic chloride
(b) chlorine
(c) chromic sulphate
(d) chromyl chloride
Show Answer & Explanation

Answer: (d) chromyl chloride

Explanation:
1. This is the chromyl chloride test for chlorides, giving red-brown fumes of \( CrO_2Cl_2 \).

Teacher's Note:
1. Test for chloride.

Question 10: Oxymuriatic acid gas is
(a) \( Cl_2 \)
(b) \( NO \)
(c) \( NO_2 \)
(d) \( NH_3 \)
Show Answer & Explanation

Answer: (a) \( Cl_2 \)

Explanation:
1. Chlorine was formerly called oxymuriatic acid gas.

Teacher's Note:
1. Old name of chlorine.

Question 11: Chlorine acts as a bleaching agent only in the presence of
(a) sunlight
(b) moisture
(c) dry air
(d) pure oxygen
Show Answer & Explanation

Answer: (b) moisture

Explanation:
1. \( Cl_2+H_2O\to HCl+HOCl \), then \( HOCl\to HCl+[O] \).
2. The nascent oxygen does the bleaching, so water is needed.

Teacher's Note:
1. Dry chlorine does not bleach.

Question 12: Nitric acid has no action on
(a) iodine
(b) sulphur
(c) platinum
(d) phosphorus
Show Answer & Explanation

Answer: (c) platinum

Explanation:
1. Noble metals such as platinum and gold are not attacked by nitric acid.
2. It oxidises iodine, sulphur and phosphorus to HIO\( _3 \), H\( _2 \)SO\( _4 \) and H\( _3 \)PO\( _4 \).

Teacher's Note:
1. Noble metals resist it.

Question 13: Among the halide ions the strongest reducing agent is
(a) fluoride
(b) chloride
(c) bromide
(d) iodide
Show Answer & Explanation

Answer: (d) iodide

Explanation:
1. The ease of oxidation to the element increases down the group.
2. \( I^- \) is oxidised most easily.

Teacher's Note:
1. Larger ion gives up electron more easily.

Question 14: The formula of iodic acid is
(a) \( HIO_3 \)
(b) \( HIO \)
(c) \( HI \)
(d) \( HIO_4 \)
Show Answer & Explanation

Answer: (a) \( HIO_3 \)

Explanation:
1. Iodine is +5 in iodic acid: \( HIO_3 \).
2. \( HIO \) is hypoiodous, \( HIO_4 \) is periodic.

Teacher's Note:
1. Naming pattern: ous/ic/per-ic.

Question 15: Nitric acid cannot function as a
(a) oxidising agent
(b) reducing agent
(c) acid
(d) nitrating agent
Show Answer & Explanation

Answer: (b) reducing agent

Explanation:
1. Nitrogen is in its highest oxidation state, +5, so it cannot be oxidised further.
2. It acts as an acid, an oxidising agent and (with sulphuric acid) a nitrating agent.

Teacher's Note:
1. Maximum oxidation state.

Question 16: The halogens are
(a) s-block elements
(b) d-block elements
(c) p-block elements
(d) f-block elements
Show Answer & Explanation

Answer: (c) p-block elements

Explanation:
1. Their outer configuration is \( ns^2np^5 \).

Teacher's Note:
1. Group 17.

Question 17: The most stable hydrogen halide is
(a) hydrogen chloride
(b) hydrogen bromide
(c) hydrogen iodide
(d) hydrogen fluoride
Show Answer & Explanation

Answer: (d) hydrogen fluoride

Explanation:
1. The H-X bond becomes weaker down the group; H-F is strongest and the most stable.

Teacher's Note:
1. Bond strength.

Question 18: When sodium is heated in ammonia, the products are
(a) sodamide and hydrogen
(b) sodamide and nitrogen
(c) nitrogen and hydrogen
(d) sodium hydride and nitrogen
Show Answer & Explanation

Answer: (a) sodamide and hydrogen

Explanation:
1. \( 2Na+2NH_3\to2NaNH_2+H_2 \).

Teacher's Note:
1. Sodium displaces hydrogen.

Question 19: The formation of ammonia in Haber's process \( N_2+3H_2\rightleftharpoons2NH_3 \) (exothermic) is NOT favoured by
(a) low temperature
(b) high temperature
(c) high pressure
(d) removing ammonia as it forms
Show Answer & Explanation

Answer: (b) high temperature

Explanation:
1. The forward reaction gives out heat, so by Le Chatelier's principle high temperature shifts the equilibrium back.
2. High pressure favours fewer moles of gas, so it favours ammonia.

Teacher's Note:
1. Exothermic reaction favoured by low temperature.

Question 20: Which of the following acts both as an oxidising agent and as a reducing agent?
(a) nitric acid
(b) fluorine
(c) nitrous acid
(d) sulphuric acid
Show Answer & Explanation

Answer: (c) nitrous acid

Explanation:
1. Nitrogen in \( HNO_2 \) is +3, between -3 and +5, so it can be oxidised or reduced.
2. The others contain the element in its highest oxidation state or only gain electrons.

Teacher's Note:
1. Intermediate oxidation state.

Question 21: Which of the following gases is highly soluble in water?
(a) nitric oxide
(b) nitrogen
(c) oxygen
(d) hydrogen chloride
Show Answer & Explanation

Answer: (d) hydrogen chloride

Explanation:
1. HCl ionises in water and dissolves very readily (about 450 volumes in one volume of water).

Teacher's Note:
1. Fountain experiment.

Question 22: The silver compound which is most used in photography is
(a) silver bromide
(b) silver chloride
(c) silver iodide
(d) silver nitrate
Show Answer & Explanation

Answer: (a) silver bromide

Explanation:
1. AgBr is very sensitive to light and is used in photographic films and plates.

Teacher's Note:
1. Light sensitive.

Question 23: Which silver halide is soluble in water?
(a) silver chloride
(b) silver fluoride
(c) silver bromide
(d) silver iodide
Show Answer & Explanation

Answer: (b) silver fluoride

Explanation:
1. AgF dissolves in water; AgCl, AgBr and AgI are insoluble.

Teacher's Note:
1. Fluoride is the exception.

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Multiple Choice Questions (MCQs) for Class 9 Chemistry Chemistry of Nitrogen and Halogens

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