Question

$\left( NH _{4}\right)_{2} Cr _{2} O _{7}$ on heating liberates a gas. The same gas will be obtained by

• A. Treating $H _{2} O _{2}$ with $NaNO _{2}$
• B. Treating $Mg _{3} N _{2}$ with $H _{2} O$
• C. Heating $NH _{4} NO _{3}$
• D. Heating $NH _{4} NO _{2}$

Answer 1

Answer: (D)

$\left( NH _{4}\right)_{2} Cr _{2} O _{7} \xrightarrow{\text { heat }} Cr _{2} O _{3}+4 H _{2} O + N _{2}$
$NH _{4} NO _{2} \xrightarrow{\Delta} 2 H _{2} O + N _{2}$