Question

Which of the following ammonium salt will produce dinitrogen on heating?

• A. $(N{H}_4{)}_{2}S{O}_4$
• B. $N{H}_{4}Cl$
• C. $N{H}_{4}N{O}_2$
• D. $N{H}_{4}N{O}_3$

Answer 1

The correct option is C $N{H}_{4}N{O}_2$

Ammonium salts decompose quite readily on heating.​
If the anion is not oxidising, ammonia is evolved.​
$\left(N{H}_4{)}_{2}S{O}_4\right(aq)\to 2N{H}_3(g)+H_{2}S{O}_4(aq)$
$N{H}_{4}Cl\left(aq\right)\to N{H}_3\left(g\right)+HCl\left(aq\right)$

If the anion is more oxidising, $N{H}_4$ is oxidised to $N_2$ or $N_{2}O$.​
$N{H}_{4}N{O}_2\left(aq\right)\to N_2\left(g\right)+2H_{2}O\left(l\right)$
$N{H}_{4}N{O}_3\left(aq\right)\to N_{2}O\left(g\right)+2H_{2}O\left(l\right)$