Question

Extra pure $N_2$ can be obtained by heating:

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

Answer 1

The correct option is D $Ba(N_3{)}_2$

Azide salt of barium is found in the purest form. On heating, it gives barium as a solid and nitrogen gas. So there is no need for further purification.
$Ba(N_3{)}_2\to Ba+3N_2$