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NEET2022Chemistryd and f Block ElementsActual

In the neutral or faintly alkaline medium, KMnO 4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from

Options

  1. A+ 6 to + 4
  2. B+ 7 to + 3
  3. C+ 6 to + 5
  4. D+ 7 to + 4

Correct answer

D. + 7 to + 4

Step-by-step solution

KMnO 4 acts as an oxidising agent. In neutral or faintly alkaline medium When alkaline KMnO 4 is treated with KI , iodide ion is oxidised to iodate IO 3 - and KMnO 4   is   reduced   to   MnO 2 . The chemical reaction can be given as, 2 KMnO 4 + H 2 O + KI → 2 MnO 2 + 2 KOH + KIO 3 The change in oxidation state of manganese in this reaction is from + 7   to   + 4 .

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