Question

The nitrate, which undergoes one thermal decomposition, leaves behind a residue that is yellow when hot and white when cold.

Options

• Lead nitrate

• Ammonium nitrate

• Copper nitrate

• Zinc nitrate

Answer 1

Zinc nitrate

Explanation:

Zinc nitrate decomposes to produce zinc oxide, which is yellow when hot and white when cold.

\[\ce{\underset{(White)}{\underset{(Zinc carbonate)}{2Zn(NO3)2}} -> \underset{(White - Cold)}{\underset{(Yellow - Hot)}{\underset{(Zinc nitrate - White)}{2ZnO}}} + \underset{(Carbon dioxide)}{4NO2} + O2}\]