Question

Very pure $N_2$ can be obtained by

• A. Thermal decomposition of ammonium dichromate
• B. Treating aqueous solution of $NH_4Cl$ and $NaNO_2$
• C. Liquifaction and fractional distillation of liquid air
• D. Thermal decomposition of sodium azide

Answer 1

Answer: (D)

Thermal decomposition of sodium azide

Answer 2

$2 NaN _{3} \stackrel{\Delta}{\longrightarrow} 2 Na _{( s )}+\underset{\text { Pure }}{3 N _{2( g )}}$