Give an example of a reaction in which `H_2 SO_4` behaves as a strong acid .

Explanation

As a strong acid: It displaces weak acid from its salts.
e.g.
`2NaCl + H_2 SO_4 overset(Delta)to Na_2 SO_4 + 2HCl`
`NaNO_3 + H_2 SO_4 overset(Delta)to Na_2 SO_4 + CO_2 + H_2 O` .