Calcium reacts with hydrochloric acid to produce

It is an example of a displacement reaction. Calcium reacts with hydrochloric acid to produce calcium chloride and hydrogen gas. The chemical equation involved in the reaction can be represented as:

$\mathrm{Ca}\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$