Give an example of a reaction in which `H_2 SO_4` behaves as an oxidising agent.

Explanation

As an oxidising agent : It can act as a strong oxidising agent.
`S + 2H_2 SO_4 ("Conc.") overset(Delta)to 3SO_2 + 2H_2 O`
`2P + 5H_2 SO_4 ("Conc.") overset(Delta)to 2H_3 PO_4 + 5SO_2 + 2H_2 O`
`C+ 2H_2 SO_4 ("Conc.") overset(Delta)to CO_2 + 2SO_2 + 2H_2 O`