While sulphue dioxide and hydrogen peroxide and act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?

Explanation

`SO_(3)`and `H_(2)O_(2)` both acts as oxidising as well as reducing agents.
`to` Ozone acts as strong oxidising agent in acidic medium (Ozone acts as reducing agent also in some cases).
`to` `HNO_(3)` acts as strong oxidising agent because in `HNO_(3)`.`He H^(+)` ion redily released and the oxida-tion state of .N. is + 5 in `HNO_(3)` so it is a good oxidising agent.