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Question

What happens when SO2 is passed in KMnO4 acidified solution?


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Solution

Chemical Reaction

  • The chemical reaction between Sulphur dioxide SO2 and KMnO4 is shown below.

5SO2g+2KMnO4s+2H2OlK2SO4aq+2MnSO4aq+2H2SO4l

Explanation

  • The above reaction is an example of a redox reaction, where oxidation, as well as reduction, occurs simultaneously.
  • Sulfur dioxide is a strong reducing agent so it reduces the potassium permanganate (purple color) to a colorless solution of potassium sulfate.
  • Potassium permanganate is a strong oxidizing agent so oxidizes sulfur dioxide to potassium sulfate.

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