Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.

(N/A) Hydrogen gas $(H_2)$ is evolved when dilute hydrochloric acid $(HCl)$ is added to a reactive metal.
When iron $(Fe)$ reacts with dilute sulphuric acid $(H_2SO_4)$,iron$(II)$ sulphate $(FeSO_4)$ is formed along with the evolution of hydrogen gas $(H_2)$.
The chemical equation is:
$Fe(s) + H_2SO_4(aq) \longrightarrow FeSO_4(aq) + H_2(g)$