Question:
While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why ?
Answer:
O2 -the oxidation state of sulphur is +4, it can loose two more electron to reach upto +6(that exists in its compound).Moreover it can gain more electrons to reach the oxidation state of -2(lowest oxidation state observed in its compound),It means it have capability to loose and gain both so it can work as oxidizing as well as reducing agents.
Ozone acts as a powerful oxidizing agent due to the reaction,
O3--> O2 + [O]
The nascent oxygen formed due to its decomposition is responsible for the oxidation of a number of substances
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