Question

A solution of colourless salt $H$ on boiling with excess $NaOH$ produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of $Zn$ dust to the same solution, the gas evolution restarts. The colourless salt(s) $H$

• A. $NH_4 NO_3$
• B. $NH_4 NO_2$
• C. $NH_4 Cl$
• D. $(NH_4)_2 SO_4$

Answer 1

Answer: (B)

$NH_4 NO_2$

Answer 2

$NH_4 NO_3 + NaOH \longrightarrow \, NaNO_3 + NH_3 + H_2 O$
$NH_4 NO_2 + NaOH \longrightarrow \, NaNO_2 + NH_3 + H_2 O$