Acids react with metals to produce the respective metal salt along with hydrogen gas. The general form of the reaction is given below:
$\text{Acid (aq)}+\text{Metal (s)}\to \text{Salt (aq)}+\text{Hydrogen (g)}$
For example:
When hydrochloric acid reacts with zinc, it produces zinc chloride along with the evolution of hydrogen gas.
The chemical reaction is given below:
$2\text{HCl (aq)}+\text{Zn (s)}\to {\text{ZnCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$