Question

The compound(s) which generate(s) $N_2$ gas upon thermal decomposition below ${300}^{o}C$ is (are):

• A. $N{H}_{4}N{O}_3$
• B. $(N{H}_4{)}_{2}C{r}_2{O}_7$
• C. $Ba(N_3{)}_2$
• D. $M{g}_3{N}_2$

Answer 1

Answer: (B), (C)

The correct options are
B $(N{H}_4{)}_{2}C{r}_2{O}_7$
C $Ba(N_3{)}_2$

(a) $N{H}_{4}N{O}_3\stackrel{△}{\to }{N}_{2}O+2H_{2}O(N_{2}O$ can further decompose to $N_2)$ and $O_2$ at temperature above ${300}^{o}C)$
(b) $(N{H}_4{)}_{2}C{r}_2{O}_7\stackrel{△}{\to }{N}_2+C{r}_2{O}_3+4H_{2}O$
(c) $Ba(N_3{)}_2\stackrel{△}{\to }3N_2+Ba$
(d) $M{g}_3{N}_2$ does not decompose at any temperature.