On heating compound (A) gives a gas (B) which is constituent of air. This gas when treated with $\mathrm{H}_{2}$ in the presence of a catalyst gives
another gas (C) which is basic in nature. (A) should not be:
Correct Option: , 2
Basic gas $(\mathrm{C})$ must be ammonia $\left(\mathrm{NH}_{3}\right)$. It means (B) gas should be $\mathrm{N}_{2}$ which is formed by heating of compound (A).
(1) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow} \mathrm{N}_{2} \uparrow+\mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O} \uparrow$
(2) $\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{PbO}+2 \mathrm{NO}_{2} \uparrow+\frac{1}{2} \mathrm{O}_{2} \uparrow$
(3) $2 \mathrm{NaN}_{3} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Na}+3 \mathrm{~N}_{2} \uparrow$
(4) $\mathrm{NH}_{4} \mathrm{NO}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{N}_{2} \uparrow+2 \mathrm{H}_{2} \mathrm{O} \uparrow$
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