Why nitric acid acts as an oxididing agent? How it oxidises: Ferrous Sulphate to Ferric sulphate acid.

Explanation

Nitric acid acts a strong oxidising agent since at readly gives nasent oxygen both in concentrated form as well as in diluted form.
`2HNO_3 ("conc.") to H_2 O + 2NO_2 + [O]`
`2HNO_3 ("dil") to H_2 O + 2NO + 3[O]`
`2HNO_3 to H_2 O + 2NO_2 + [O]`
`2FeSO_4 + H_2 SO_4 + [O] to Fe_2 (SO_4)_3 + H_2 O`
`2FeSO_4 + 2HNO_3 + H_2 SO_4 to Fe_2 (SO_4)_3 + 2H_2 O + 2NO_2`