$SO_2$ is a strong reducing agent; however,it can also act as an oxidising agent. Which of the following shows its oxidising nature?

  • A
    Bleaching action
  • B
    Decolourising of acidified $KMnO_4$ solution
  • C
    Reaction with $H_2S$ to give sulphur
  • D
    Turning acidified dichromate paper green

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