HNO3 acid acts only as oxidising agent but HNO2acid acts like both oxidising agent and reducing agent? why?
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.