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JEE MainChemistryd and f Block Elements

Potassium permanganate ( KMnO ₄ ) acts as a strong oxidising agent. When it reacts with an iodide salt in a neutral or faintly alkaline medium, it oxidises the iodide ion. The overall change in the oxidation state of iodine in this reaction is

Options

  1. A1
  2. B3
  3. C5
  4. D6

Correct answer

D. 6

Step-by-step solution

In a neutral or faintly alkaline medium, KMnO ₄ oxidises iodide ( I ^- ) to iodate ( IO ₃^- ). The oxidation state of iodine in the iodide ion ( I ^- ) is -1 . Let the oxidation state of iodine in the iodate ion ( IO ₃^- ) be x . x + 3(-2) = -1 x = +5 The change in the oxidation state of iodine is |+5 - (-1)| = 6 . Answer: 6

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