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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Reduction of metal centre in aqueous permanganate ion involves (1) 5 electrons in neutral medium (2) 5 electrons in acidic medium (3) 3 electrons in neutral medium (4) 3 electrons in alkaline medium

Options

  1. A1,2
  2. B2,3
  3. C1,3
  4. D2,3,4

Correct answer

B. 2,3

Step-by-step solution

In acidic medium M n O 4 - + 8 H + + 5 e - 1 → M n 2 + + 4 H 2 O In neutral medium Mn O 4 - + 2 H 2 O + 3 e - → Mn O 2 + 4O H - Hence, number of electrons gained in acidic and neutral mediums are 5 and 3 electrons respectively.

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