Chapter 15

Nitrogen is liberated by the thermal decomposition of only (a) \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (b) \(\mathrm{NaN}_{3}\) (c) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (d) all the three

Which of the following oxide of nitrogen is most thermally stable? (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) NO (c) \(\mathrm{N}_{2} \mathrm{O}_{3}\) (d) \(\mathrm{N}_{2} \mathrm{O}_{5}\)

Which of the following is not correct? (a) Nitric oxide in solid state exhibits diamagnetic property. (b) \(\mathrm{NH}_{3}\) is a weak reducing agent compared to \(\mathrm{PH}_{3}\) (c) Hydrolysis of \(\mathrm{NCl}_{3}\) gives \(\mathrm{NH}_{3}\) and \(\mathrm{HOCl}\) (d) \(\mathrm{NH}_{3}\) is less stable than \(\mathrm{PH}_{3}\)

In liquid \(\mathrm{NH}_{3}\) (a) \(\mathrm{CH}_{3} \mathrm{COOH}\) behaves as strong acid (b) \(\mathrm{NaNH}_{2}\) is a base (c) \(\mathrm{NH}_{4} \mathrm{Cl}\) is an acid (d) All the above facts are true

Ammonium compound which does not give \(\mathrm{NH}_{3}\) on heating is (a) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}\) (b) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (d) \(\mathrm{NH}_{4} \mathrm{Cl}\)

\(\mathrm{NH}_{4} \mathrm{Cl}(\mathrm{s})\) is heated in a test tube. Vapours are brought in contact with red litmus paper, which changes to blue and then to red. It is because of (a) formation of \(\mathrm{NH}_{3}\) and \(\mathrm{HCl}\) (b) formation of \(\mathrm{NH}_{4} \mathrm{OH}\) and \(\mathrm{HCl}\) (c) greater diffusion of \(\mathrm{HCl}\) than \(\mathrm{NH}_{3}\) (d) greater diffusion of \(\mathrm{NH}_{3}\) than \(\mathrm{HCl}\)

The lightening bolts in the atmosphere cause the formation of (a) NO (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{NH}_{4} \mathrm{OH}\) (d) \(\mathrm{NH}_{2} \mathrm{OH}\)

The bonds present in \(\mathrm{N}_{2} \mathrm{O}_{5}\) are (a) only ionic (b) covalent and coordinate (c) only covalent (d) covalent and ionic

Which of the following is a nitric acid anhydride? (a) \(\mathrm{N}_{2} \mathrm{O}_{5}\) (b) \(\mathrm{NO}\) (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{N}_{2} \mathrm{O}_{3}\)

Nitrogen dioxide cannot be prepared by heating (a) \(\mathrm{KNO}_{3}\) (b) \(\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) (c) \(\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) (d) \(\mathrm{AgNO}_{3}\)

The gas which is liberated when \(\mathrm{PbO}_{2}\) reacts with concentrated \(\mathrm{HNO}_{3}\) (a) \(\mathrm{NO}_{2}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{N}_{2} \mathrm{O}\) (d) \(\mathrm{N}_{2}\)

\(\mathrm{NH}_{3}\) cannot be obtained by (a) heating of \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) or \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (b) heating of \(\mathrm{NH}_{4} \mathrm{Cl}\) or \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) (c) heating of \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) with \(\mathrm{NaOH}\) (d) reaction of AIN or \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) or \(\mathrm{CaCN}_{2}\) with \(\mathrm{H}_{2} \mathrm{O}\)

Ammonia can be dried by (a) conc. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (b) \(\mathrm{P}_{4} \mathrm{O}_{10}\) (c) \(\mathrm{CaO}\) (d) anhydrous \(\mathrm{CaCl}_{2}\)

Ammonia reacts with sodium hypochlorite to give (a) \(\mathrm{N}_{2} \mathrm{O}\) (b) \(\mathrm{N}_{2}\) (c) \(\mathrm{NH}_{2} \mathrm{OH}\) (d) \(\mathrm{H}_{2} \mathrm{~N} . \mathrm{NH}_{2}\)

Which of the following is not correct? (a) a mixture of \(\mathrm{Ca}(\mathrm{CN})_{2}\) and \(\mathrm{C}\) is known as nitrolim (b) hydrolysis of \(\mathrm{NCl}_{3}\) gives \(\mathrm{NH}_{3}\) and \(\mathrm{HOCl}\) (c) a mixture of \(\mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2}\) and \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\) is known as super phosphate of lime (d) ammonia is used as refrigerant

The industrial preparation of nitric acid by Ostwald's process involves (a) hydrolysis of \(\mathrm{NH}_{3}\) (b) reduction of \(\mathrm{NH}_{3}\) (c) hydrogenation of \(\mathrm{NH}_{3}\) (d) oxidation of \(\mathrm{NH}_{3}\)

Which one of the following is used in the industrial preparation of nitric acid by Ostwald's process? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{N}_{2} \mathrm{O}_{5}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (d) \(\mathrm{N}_{2}\)

What are the products obtained when ammonia is reacted with excess chlorine? (a) \(\mathrm{N}_{2}\) and \(\mathrm{NH}_{4} \mathrm{Cl}\) (b) \(\mathrm{N}_{2}\) and \(\mathrm{NCl}_{3}\) (c) \(\mathrm{NCl}_{3}\) and \(\mathrm{HCl}\) (d) \(\mathrm{N}_{2}\) and \(\mathrm{HCl}\)

Aqueous solution of ammonia consists of (a) \(\mathrm{NH}_{4}^{+}\)and \(\mathrm{OH}^{-}\) (b) \(\mathrm{OH}^{-}\) (c) \(\mathrm{NH}_{4}^{+}\) (d) \(\mathrm{H}^{+}\)

The molarity of pure water at \(277 \mathrm{~K}\) is (a) \(1 \mathrm{M}\) (b) \(5 \mathrm{M}\) (c) \(55.5 \mathrm{M}\) (d) \(2.5 \mathrm{M}\)

\(2 \mathrm{~g}\) of aluminium is treated separately with excess of dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) and excess of \(\mathrm{NaOH}\). The ratio of the volumes of hydrogen evolved is (a) \(1: 1\) (b) \(1: 2\) (c) \(2: 1\) (d) \(2: 3\)

The oxidation states of the most electronegative element in the products of the reaction, \(\mathrm{BaO}_{2}\) with dilute \(\mathrm{H}_{2} \mathrm{SO}_{4}\) are (a) 0 and \(-1\) (b) \(-1\) and \(-2\) (c) \(-2\) and 0 (d) \(-2\) and \(+1\)

The percentage by weight of hydrogen in \(\mathrm{H}_{2} \mathrm{O}_{2}\) is (a) \(6.5\) (b) \(5.88\) (c) 25 (d) 50

Polyphosphates are used as water softening agents because they (a) form soluble complexes with cationic species (b) precipitate cationic species (c) precipitate anionic species (d) form soluble complexes with anionic species

Which of the following statements are correct? (1) Temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium in it (2) Permutit is artificial zeolite (3) \(\mathrm{H}_{2} \mathrm{O}_{2}\) acts as an oxidizing agent in the following reaction $$ \mathrm{Cl}_{2}+\mathrm{H}_{2} \mathrm{O}_{2} \longrightarrow \mathrm{O}_{2}+2 \mathrm{HCl} $$ (4) \(\mathrm{H}_{2} \mathrm{O}_{2}\) is used a bleaching agent for delicate textiles. (a) 1,2 and 3 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,3 and 4

With respect to both oxygen and ozone which one of the following statements are correct? (1) oxygen has 2 bonds and ozone has 3 bonds (2) oxygen valency is 2 in both (3) oxygen is colourless while ozone is coloured (4) both have similar reactivity with water (a) 1,2 and 3 (b) 2,3 and 4 (c) 2 and 3 (d) 1 and 2

In which of the following reactions ozone acts as an oxidizing agent? (1) \(2 \mathrm{HCl}+\mathrm{O}_{3} \longrightarrow \mathrm{Cl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\) (2) \(\mathrm{BaO}_{2}+\mathrm{O}_{3} \longrightarrow \mathrm{BaO}+2 \mathrm{O}_{2}\) (3) \(2 \mathrm{KI}+\mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O} \longrightarrow 2 \mathrm{KOH}+\mathrm{I}_{2}+\mathrm{O}_{2}\) (4) \(\mathrm{PbS}+4 \mathrm{O}_{3} \longrightarrow \mathrm{PbSO}_{4}+4 \mathrm{O}_{2}\) (a) 1,2 and 4 (b) 2 and 3 (c) 1,3 and 4 (d) 1 and 2

Ammonia on reaction with hypochlorite anion can form (1) NO (2) \(\mathrm{NH}_{4} \mathrm{Cl}\) (3) \(\mathrm{N}_{2} \mathrm{H}_{4}\) (4) \(\mathrm{HNO}_{2}\) (a) 1,2 (b) 2,3 (c) 3,4 (d) \(2,3,4\)

Concentrated \(\mathrm{HNO}_{3}\) reacts with iodine to give (a) \(\mathrm{HI}\) (b) HOI (c) \(\mathrm{HOIO}_{2}\) (d) \(\mathrm{HOIO}_{3}\)

The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are (a) \(\mathrm{O}_{2}, \mathrm{O}_{3}\) (b) \(\mathrm{N}_{2} \mathrm{O}, \mathrm{O}_{3}\) (c) \(\mathrm{SO}_{2}, \mathrm{CH}_{4}\) (d) \(\mathrm{O}_{3}, \mathrm{CH}_{4}\)

Which of the following pairs are correctly matched here? (1) Solvay process, Manufacture of sodium carbonate (2) Baeyer process, Manufacture of sulphuric acid (3) Haber process, Manufacture of ammonia (4) Birkland-Eyde process, Manufacture of nitric acid Select the correct answer: (a) 1,2 and 4 (b) 1,3 and 4 (c) 2,3 and 4 (d) 2 and 3 only

An orange solid (A) on heating gives a green residue (B), a colourless gas (C) and water vapours. The dry gas (C) on passing over heated magnesium gave a white solid (D). (D) on reaction with water gives a gas (E) which gives dense white fumes with HCl. Here, (E) will be (a) \(\mathrm{N}_{2}\) (b) \(\mathrm{NO}_{2}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{N}_{2} \mathrm{O}^{2}\)

Identify the two liquids \((\mathrm{X})\) and \((\mathrm{Y})\) made up of same atoms, both \((\mathrm{X})\) and \((\mathrm{Y})\) are diamagnetic. \((\mathrm{X})\) turns blue litmus to red, but (Y) does not. Also \(\mathrm{X}+\mathrm{KI}+\mathrm{H}^{+} \stackrel{\text { Starch }}{\longrightarrow}\) Blue colour \(\mathrm{Y}+\mathrm{KI}+\mathrm{H}^{+} \stackrel{\text { Starch }}{\longrightarrow}\) No colour (a) \(\mathrm{X}=\mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{Y}=\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{X}=\mathrm{H}_{2} \mathrm{O}, \mathrm{Y}=\mathrm{H}_{2} \mathrm{O}_{2}\) (c) Both \(\mathrm{X}\) and \(\mathrm{Y}\) are \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{X}=\mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{Y}=\mathrm{O}_{3}\)

Which of the following equations is not correct? (1) \(2 \mathrm{Na}+2 \mathrm{NH}_{3} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{NaNH}_{2}+\mathrm{H}_{2}\) (2) \(4 \mathrm{NH}_{3}+2 \mathrm{NaOCl} \longrightarrow 2 \mathrm{NH}_{4} \mathrm{Cl}+2 \mathrm{NaNH}_{2}\) \(+\mathrm{O}_{2}\) (3) \(\mathrm{NH}_{3}+3 \mathrm{Cl}_{2} \stackrel{\text { Excess }}{\text { Excess }} \mathrm{NCl}_{3}+3 \mathrm{HCl}\) (4) \(\mathrm{NH}_{3}^{3}+3 \mathrm{Cl}_{2}^{2} \stackrel{\text { Excess }}{\longrightarrow} \mathrm{NCl}_{3}^{3}+3 \mathrm{HCl}\) (a) 2 and 3 only (b) 1 and 4 only (c) 3 only (d) 2 only

The dissociation constant of water \(\left(\mathrm{H}_{2} \mathrm{O}\right)\) is \(1.0 \times 10-{ }^{14}\) and that of heavy water \(\left(\mathrm{D}_{2} \mathrm{O}\right)\) is \(3.0 \times 10^{-15}\). This is because the extent of dissociation of \(\mathrm{H}_{2} \mathrm{O}\) is about (a) \(1 / 3\) times that of \(\mathrm{D}_{2} \mathrm{O}\) (b) 3 times that of \(\mathrm{D}_{2} \mathrm{O}\) (c) 3000 times that of \(\mathrm{D}_{2} \mathrm{O}\) (d) 30 times that of \(\mathrm{D}_{2} \mathrm{O}\)

Which of the following equations are correctly formulated here? (1) \(4 \mathrm{Sn}+10 \mathrm{HNO}_{3}\) (dilute) \(\longrightarrow 4 \mathrm{Sn}\left(\mathrm{NO}_{3}\right)_{2}\) \(+\mathrm{NH}_{4} \mathrm{NO}_{3}+\) \(3 \mathrm{H}_{2} \mathrm{O}\) (2) \(3 \mathrm{Zn}+8 \mathrm{HNO}_{3}\) (very dilute) \(\longrightarrow 3 \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2}\) \(+2 \mathrm{NO}+4 \mathrm{H}_{2} \mathrm{O}\) (3) \(3 \mathrm{Cu}+8 \mathrm{HNO}_{3}\) (dilute) \longrightarrow \(3 \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}\) \(+2 \mathrm{NO}+4 \mathrm{H}_{2} \mathrm{O}\) (4) \(\mathrm{As}+3 \mathrm{HNO}_{3}\) (dilute) \(\longrightarrow \mathrm{H}_{3} \mathrm{AsO}_{3}+3 \mathrm{NO}_{2}\) (a) 1,2 and 3 (b) 1,3 and 4 (c) 2,3 and 4 (d) 1,2 and 4

Consider the following reactions: (1) \(\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{HX} \longrightarrow \mathrm{X}_{2}+2 \mathrm{H}_{2} \mathrm{O}\) (2) \(\mathrm{H}_{2} \mathrm{O}_{2}+\mathrm{O}_{3} \longrightarrow 2 \mathrm{O}_{2}+\mathrm{H}_{2} \mathrm{O}\) Here, hydrogen peroxide acts as (a) an oxidizing agent in both (1) and (2) (b) an oxidizing agent in ( 2 ) and reducing agent in (1)

In which of the following reactions does ammonia act as an oxidizing agent? (a) \(3 \mathrm{NaClO}+2 \mathrm{NH}_{3} \longrightarrow 3 \mathrm{NaCl}+\mathrm{N}_{2}+3 \mathrm{H}_{2} \mathrm{O}\) (b) \(3 \mathrm{CaOCl}_{2}+2 \mathrm{NH}_{3} \longrightarrow 3 \mathrm{CaCl}_{2}+\mathrm{N}_{2}+3 \mathrm{H}_{2} \mathrm{O}\) (c) \(4 \mathrm{NH}_{3}+5 \mathrm{O}_{2} \longrightarrow 4 \mathrm{NO}+6 \mathrm{H}_{2} \mathrm{O}\) (d) none of these

Which represents the correct decreasing order of dissociation constants \(\mathrm{K}_{1}, \mathrm{~K}_{2}\) and \(\mathrm{K}_{3}\) for \(\mathrm{HNO}_{2}, \mathrm{~N}_{3} \mathrm{H}\) and \(\mathrm{HNO}_{3}\) respectively? (a) \(\mathrm{K}_{2}>\mathrm{K}_{1}>\mathrm{K}_{3}\) (b) \(\mathrm{K}_{1}>\mathrm{K}_{2}>\mathrm{K}_{3}\) (c) \(\mathrm{K}_{3}>\mathrm{K}_{1}>\mathrm{K}_{2}\) (d) \(\mathrm{K}_{3}>\mathrm{K}_{2}>\mathrm{K}_{1}\)

Consider the following statements: I. Rate of transfer of \(\mathrm{D}^{+}\)from \(\mathrm{D}_{2} \mathrm{O}\) is slower than that of \(\mathrm{H}^{+}\)from \(\mathrm{H}_{2} \mathrm{O}\). II. \(\mathrm{K}_{\mathrm{a}}\) for \(\mathrm{CH}_{3} \mathrm{COOH} \rightleftharpoons \mathrm{CH}_{3} \mathrm{COO}^{-}+\mathrm{H}^{+}\)is nearly similar to that of \(\mathrm{K}_{\mathrm{a}}\) for \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~N}^{+} \mathrm{H}_{3}\) III. \({ }_{1} \mathrm{H}^{3}\) is a radioactive isotope. Here, correct statements are: (a) I, II, III (b) II, III (c) I, II (d) I, III

When a zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with (1) \(\mathrm{H}^{+}\)ions (2) \(\mathrm{Ca}^{2+}\) ions (3) \(\mathrm{SO}_{4}^{-2}\) ions (4) \(\mathrm{Mg}^{2+}\) ions (a) 2,4 (b) \(1,2,3\) (c) \(2,4,5\) (d) all are correct

Nitrogen (I) oxide is produced by 1\. thermal decomposition of ammonium nitrate 2\. disproportionation of \(\mathrm{N}_{2} \mathrm{O}_{4}\) 3\. thermal decomposition of ammonium nitrite 4\. interaction of hydroxyl amine and nitrous acid (a) 1,2 (b) 2,3 (c) 1,4 (d) 2,4

Consider the following statements: I. atomic hydrogen is obtained by passing hydrogen through an electric arc II. hydrogen gas will not reduce heated aluminium oxide III. finely divided palladium absorbs large volume of hydrogen gas IV. pure nascent hydrogen is best obtained by reacting \(\mathrm{Na}\) with \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) Which of the above statements is/are correct? (a) I alone (b) II alone (c) I, II, and III (d) II, III and IV

Find \([\mathrm{A}],[\mathrm{B}]\) and \([\mathrm{C}]\) respectively in the reaction given below: \([\mathrm{A}]+\mathrm{Na}\left[\mathrm{Cr}(\mathrm{OH})_{4}\right] \stackrel{\mathrm{H}_{2} \mathrm{O}_{2}, \text { boil }}{\longrightarrow}[\mathrm{B}] \stackrel{\mathrm{H}_{2} \mathrm{SO}_{4}}{\longrightarrow}[\mathrm{C}]\) Yellow Orange colour compound (a) \(\mathrm{NaOH}, \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{Na}_{2} \mathrm{CrO}_{4}\) (b) \(\mathrm{NaOH}, \mathrm{Na}_{2} \mathrm{CrO}_{4}, \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (c) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{CrO}_{4}, \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\) (d) \(\mathrm{NaOH}, \mathrm{K}_{2} \mathrm{CrO}_{4}, \mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\)

A substance 'A' is obtained by boiling an aqueous solution of \(\mathrm{NH}_{3}\) with an aqueous solution of sodium hypochlorite in the presence of a little glue. 'A' forms salts with \(\mathrm{HCl}\) and \(\mathrm{H}_{2} \mathrm{SO}_{4} \cdot^{'} \mathrm{~A}^{\prime}\) is a powerful reducing agent and reduces \(\mathrm{FeCl}_{3}\) solution and acidified \(\mathrm{KMnO}_{4}\) solution. This reaction is being accompanied by evolution of inactive gas ' \(\mathrm{B}\) '. Identify 'A' and ' \(\mathrm{B}\) '. (a) \(\mathrm{A}=\mathrm{O}_{3} ; \mathrm{B}=\mathrm{H}_{2} \mathrm{O}_{2}\) (b) \(\mathrm{A}=\mathrm{NH}_{2} \cdot \mathrm{NH}_{2} ; \mathrm{B}=\mathrm{N}_{2}\) (c) \(\mathrm{A}=\mathrm{N}_{2} ; \mathrm{B}=\mathrm{NO}_{2}\) (d) \(\mathrm{A}=\mathrm{N}_{3} \mathrm{H} ; \mathrm{B}=\mathrm{N}_{2}\)

Which of the following statements about \(\mathrm{N}_{2} \mathrm{O}\) are correct? (1) \(\mathrm{NO}_{2}\) supports the combustion of phosphorous and sulphur (2) \(\mathrm{N}_{2} \mathrm{O}\) is a linear asymmetrical molecule, \(\mathrm{N}-\mathrm{N}-\mathrm{O}\). (3) \(\mathrm{N}_{2} \mathrm{O}\) is a bent molecule (4) \(\mathrm{N}_{2} \mathrm{O}\) is reduced to \(\mathrm{N}_{2}\) when passed over hot copper (a) 1,2 and 3 (b) 2 and 4 only (c) 1,2 and 4 (d) 2,3 and 4

Hydrogen peroxide: (a) Give silver peroxide with moist silver oxide (b) Turn the mixture of aniline, \(\mathrm{KClO}_{3}\) and dil. \(\mathrm{H}_{2} \mathrm{SO}_{4}\) violet (c) Liberate iodine from \(\mathrm{KI}\) (d) Turn the titanium salt yellow

In which of the following reactions, \(\mathrm{H}_{2} \mathrm{O}_{2}\) acts as an oxidant? (a) \(\mathrm{PbO}_{2}(\mathrm{~s})+\mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow \mathrm{PbO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{O}_{2}(\mathrm{~g})\) (b) \(\mathrm{KNO}_{2}\) (aq) \(+\mathrm{H}_{2} \mathrm{O}_{2}\) (aq) \(\rightarrow \mathrm{KNO}_{3}\) (aq) \(+\mathrm{H}_{2} \mathrm{O}\) (l) (c) \(2 \mathrm{KI}\) (aq) \(+\mathrm{H}_{2} \mathrm{O}_{2}\) (aq) \(\rightarrow 2 \mathrm{KOH}\) (aq) \(+\mathrm{I}_{2}(\mathrm{~s})\) (d) \(\mathrm{Na}_{2} \mathrm{SO}_{3}\) (aq) \(+\mathrm{H}_{2} \mathrm{O}_{2}\) (aq) \(\rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}\)

Which one of the following reactions represents the reducing property of \(\mathrm{H}_{2} \mathrm{O}_{2} ?\) (a) \(2 \mathrm{NaI}+\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+\mathrm{I}_{2}+2 \mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{PbO}_{2}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{PbO}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\) (c) \(2 \mathrm{KMnO}_{4}+3 \mathrm{H}_{2} \mathrm{SO}_{4}+5 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+8 \mathrm{H}_{2} \mathrm{O}\) \(+5 \mathrm{O}_{2}+2 \mathrm{MnO}_{2}\) (d) \(2 \mathrm{~K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]+2 \mathrm{KOH}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{~K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) \(+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}\)

Which of the following compounds give nitrogen on heating? (a) \(\mathrm{NaN}_{3}\) (b) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (d) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}\)