Question

${\text{H}}_2$ gas is evolved when iron is added to dil. ${\text{H}}_2{\text{SO}}_4$ and not when copper is added to dil. ${\text{H}}_2{\text{SO}}_4$.

• A. True
• B. False

Answer 1

The correct option is A True

Iron is more reactive in nature than hydrogen. When iron is made to react with dil. ${\text{H}}_2{\text{SO}}_4$ , it can displace hydrogen from the acid to form iron sulphate and hydrogen gas. The reaction involved is:

$\text{Fe}\text{(s)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to {\text{FeSO}}_4\text{(aq)}+{\text{H}}_2\text{(g)}$

Copper is less reactive than hydrogen. Hence it cannot displace hydrogen from sulphuric acid.