Which gas is produced when dilute hydrochloric acid is added to a reactive metal ? Write the chemical reaction when iron reacts with dilute \( H_2 SO_4 \).

When a reactive metal reacts with dilute hydrochloric acid hydrogen gas is produced along with salt of the metal.The reactive metal displaces the hydrogen from acid and releases hydrogen gas.

\( Fe(s) + dil. H_2 SO_4 (aq) \)

\( ↓ \)

\(FeSO_4 (aq) + H_2 (g) \)