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Oxoacids of Halogens

HNO3 acid act...

Question

HNO₃acid acts only as oxidising agent but HNO₂acid acts like both oxidising agent and reducing agent? why?

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Solution

The oxidation state of N in HNO₃ is +5 which is maximum for N.Therefore, it acts as an oxidizing agent by gaining electrons.
But the oxidation state of N in HNO₂ is +3 which can be increased or decreased. Therefore, it acts as an oxidizing as well as reducing agent.

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