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JEE Main202229 Jul 2022Morning ShiftChemistryd and f Block ElementsActual

In neutral or faintly alkaline medium, KMnO 4 being a powerful oxidant can oxidise, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be

Options

  1. A5
  2. B1
  3. C0
  4. D3

Correct answer

D. 3

Step-by-step solution

KMnO 4 acts as an oxidising agent. In neutral or faintly alkaline medium alkaline KMnO 4 is reduced to MnO 2 . 8 MnO 4 - + 3 S 2 O 3 2 - + H 2 O → 8 MnO 2 + 6 SO 4 2 - + 2 OH - The change in oxidation state of manganese in this reaction is from + 7 to + 4 . So, In this reaction overall change in oxidation state of manganese will be 3.

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