pBlock ElementsII 1 Question 96
92. Write the balanced chemical equations for the following.
(i) Sodium nitrite is produced by absorbing the oxides of nitrogen in aqueous solution of washing soda.
(ii) Nitrogen is obtained in the reaction of aqueous ammonia with potassium permanganate.
(iii) Elemental phosphorus reacts with concentrated $\mathrm{HNO}_{3}$ to give phosphoric acid.
(iv) Sulphur is precipitated in the reaction of hydrogen sulphide with sodium bisulphite solution.
(v) Carbon dioxide is passed through a suspension of limestone in water.
$(1991,1 \times 5=5 \mathrm{M})$
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Solution:
- (i) $\mathrm{Na}{2} \mathrm{CO}{3}+\mathrm{NO}+\mathrm{NO}{2} \longrightarrow 2 \mathrm{NaNO}{2}+\mathrm{CO}_{2}$
(ii) $2 \mathrm{KMnO}{4}+2 \mathrm{NH}{3} \longrightarrow 2 \mathrm{MnO}{2}+2 \mathrm{KOH}+2 \mathrm{H}{2} \mathrm{O}+\mathrm{N}_{2}$
(iii) $\mathrm{P}{4}+20 \mathrm{HNO}{3} \longrightarrow 4 \mathrm{H}{3} \mathrm{PO}{4}+20 \mathrm{NO}{2}+4 \mathrm{H}{2} \mathrm{O}$
(iv) $2 \mathrm{H}{2} \mathrm{~S}+\mathrm{NaHSO}{3}+\mathrm{H}^{+} \longrightarrow 3 \mathrm{~S}+3 \mathrm{H}_{2} \mathrm{O}+\mathrm{Na}^{+}$
(v) $\mathrm{CaCO}{3}+\mathrm{CO}{2}+\mathrm{H}{2} \mathrm{O} \longrightarrow \mathrm{Ca}\left(\mathrm{HCO}{3}\right)_{2}$
