Question

Which gas is produced when dilute hydrochloric acid is added to a reactive metal? 

Answer 1

Hydrogen gas is evolved when dilute hydrochloric acid is added to a reactive metal.

\[\ce{\underset{Zinc}{Zn_{(s)}} + \underset{acid}{\underset{Hydrochloric}{2HCl(dil.)}}-> \underset{Zinc chloride}{ZnCl2_{(aq)}} + \underset{Hydrogen}{H2_{(g)}}}\]

Iron and dilute H₂SO₄ react as follows:

\[\ce{Fe_{(s)} + H2SO4(dil.) -> FeSO4_{(aq)} + H2_{(g)}}\]