Which of the following can act as both an oxidising agent and a reducing agent? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**(A)** $H_2O_2$: O.S. of $O$ is -1 (can go to 0 or -2). <br>**(B)** $SO_2$: O.S. of $S$ is +4 (can go to +6 or 0/-2). <br>**(C)** $HNO_2$: O.S. of $N$ is +3 (can go to +5 or +2/0). <br>**(D)** $KMnO_4$: $Mn$ is in its max O.S. (+7), so it can only be reduced (OA only).