Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Question.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$.

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

When iron reacts with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$, iron (II) sulphate with the evolution of hydrogen gas is formed.

$\mathrm{Fe}(\mathrm{s})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})$
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