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JEE Main202226 Jun 2022Evening ShiftChemistryRedox ReactionsActual

Which one of the following is an example of disproportionation reaction?

Options

  1. A3 MnO 4 2 - + 4 H + → 2 MnO 4 - + MnO 2 + 2 H 2 O
  2. BMnO 4 - + 4 H + + 4 e - → MnO 2 + 2 H 2 O
  3. C10 I - + 2 MnO 4 - + 16 H + → 2 Mn 2 + + 8 H 2 O + 5 I 2
  4. D8 MnO 4 - + 3   S 2 O 3 2 - + H 2 O → 8 MnO 2 + 6 SO 4 2 - + 2 OH -

Correct answer

A. 3 MnO 4 2 - + 4 H + → 2 MnO 4 - + MnO 2 + 2 H 2 O

Step-by-step solution

Disproportionation reaction, also sometimes called dismutation reaction, is basically a type of redox reaction involving simultaneous reduction and oxidation of atoms of the same element from one oxidation state (OS) to two different oxidation states. 3 MnO 4 2 - + 6 + 4 H + ⟶ 2 MnO 4 - + 7 + MnO 2 + 4 + 2 H 2 O

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