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HNO2 theoxidation state of Nitrogen is +4. So Nitrogen can get oxidized as well as reduced. Therefore it acts both as oxidizing and reducing agent.
SO2 can act as both oxidizing as well as reducing agent since it has +4 oxidation state which is exactly between its highest oxidation state +6 and lowest oxidation state +2 ,Thus it can change its oxidation number either from +4 to-2(reduction) and +4 to+6 (oxidation) .