# On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H2 in the presence of

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On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with $\require{mhchem}\ce{H2}$ in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :

(1) $\ce{(NH4)2Cr2O7}$

(2) $\ce{NH4NO2}$

(3) $\ce{Pb(NO3)2}$

(4) $\ce{NaN3}$
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The p block elements, nitric acid

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Ans. (3) $\ce{Pb(NO3)2}$

Sol. (1) $\ce{(NH4)2Cr2O7->[\Delta]N2 + Cr2O3 + H2O}$

(2) $\ce{NH4NO2->[\Delta]N2 + 2H2O}$

(3) $\ce{Pb(NO3)2->[\Delta]PbO + 2NO2}$

(4) $\ce{NaN3 ->[300ºC] 3N2 + 2Na}$

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Amazing solving of reactions