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JEE Main202227 Jul 2022Evening ShiftChemistryd and f Block ElementsActual

In neutral or alkaline solution, MnO 4 - oxidises thiosulphate to

Options

  1. AS 2 O 7 2 -
  2. BS 2 O 8 2 -
  3. CSO 3 2 -
  4. DSO 4 2 -

Correct answer

D. SO 4 2 -

Step-by-step solution

KMnO 4 is a strong oxidising agent in acidic,alkaline or neutral medium as well Thiosulphate is oxidised almost quantitatively to sulphate: 8 MnO 4 + - 3 S 2 O 3 + 2 - H 2 O ⟶ 8 MnO 2 + 6 SO 4 + 2 - 2 OH - The equivalent weight of KMnO 4 in the above reaction = 158 5

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