Which of the following oxides can act both as oxidising agent as well as reducing agent?

Step-by-step solution

S O 2 oxides can act both as an oxidising agent as well as reducing agent. It behaves as a reducing agent in most conditions. It convert iron (III) ions to iron (II) ions and decolourises acidified potassium permanganate (VII) solution. 2 F e 3 + S O 2 + 2 H 2 ⊙ → 2 F e 2 + + S O 4 2 - + 4 H + When S O 2 reacts with H 2 S , it produces sulphur and water. In this reaction, ‘ S O 2 ’ act as an oxidising agent.