Question

What happens when nitric acid is added to egg shell?​

Answer 1

An egg shell is composed of calcium carbonate ${\text{(CaCO}}_3)$. Therefore, nitric acid produces calcium nitrate, carbon dioxide gas and water when added to an egg shell.
The chemical equation for the reaction can be given as:
${\text{CaCO}}_3\text{(s)}+2{\text{HNO}}_3\text{(aq)}\to {\text{Ca(NO}}_3{)}_2\text{(aq)}+{\text{CO}}_2\text{(g)}+{\text{H}}_2\text{O}\text{(l)}$