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  4. HNO2 acts both as reductant and as oxidant, while HNO3 acts only as oxidant. It is due to their

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Q. $HNO_{2}$ acts both as reductant and as oxidant, while $HNO_3$ acts only as oxidant. It is due to their

Redox Reactions

Solution:

In $H \overset{*}{N}O_{2}$ oxidation number of $N = + 3$
In $H \overset{*}{N}O_{2}$ oxidation number of $N = + 5.$