Question

What happens when dilute hydrochloric acid is added to zinc metal? Explain.

Answer 1

When dilute Hydrochloric acid is added to Zinc metal, a new substance is formed along with the evolution of colorless odorless Hydrogen gas. Since a new material is formed, it is a chemical change. This change is irreversible and permanent.

That is,

$\mathrm{Zn}+2\mathrm{HCl}\to {\mathrm{ZnCl}}_2+{\mathrm{H}}_2$