JEE Advance - Chemistry (2018 - Paper 1 Offline - No. 3)
The compounds(s) which generate(s) $${N_2}$$ gas upon thermal decomposition below $${300^ \circ }C$$ is (are)
$$N{H_4}N{O_3}$$
$$\left( {N{H_4}} \right){}_2C{r_2}O{}_7$$
$$Ba{\left( {{N_3}} \right)_2}$$
$$M{g_3}{N_2}$$
Explanation
(A) $$N{H_4}N{O_3}\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{below\,300^\circ C}} {N_2}O + 2{H_2}O$$
$${N_2}O\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{above\,600^\circ C}} {N_2} + {O_2}$$
(B) $${(N{H_4})_2}C{r_2}{O_7}\buildrel \Delta \over \longrightarrow {N_2} + C{r_2}{O_3} + 4{H_2}O$$
(C) $$Ba{({N_3})_2}\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{180^\circ C}^\Delta } Ba + 3{N_2}$$
(D) $$M{g_3}{N_2}\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{above\,700^\circ C}} 3Mg + {N_2}$$
Hence, only $${(N{H_4})_2}C{r_2}{O_7}$$ and $$Ba{({N_3})_2}$$ can provide N2 gas on heating below $$300^\circ C$$
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