Question

Which of the following compounds are used to prepare $N_2$?

• A. Ammonium chloride
• B. Ammonium sulphate
• C. Sodium chloride
• D. Sodium nitrite

Answer 1

Answer: (A), (D)

The correct options are
A

Ammonium chloride

D

Sodium nitrite

This is the laboratory method of preparing $N_2$ gas:

Ammonium chloride and sodium nitrite are mixed together and heated.

$N{H}_{4}Cl+NaN{O}_2⟶N{H}_{4}N{O}_2+NaCl$

Ammonium nitrite is formed and it is unstable.

$N{H}_{4}N{O}_2⟶N_2+2H_{2}O$

So it decomposes to give nitrogen.