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JEE Chemistry · Easy

Redox Reactions: Half reaction MCQ

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Half reactionEasyQuestion 700005

Question

The number of electrons transferred in the half-reaction MnO₄⁻ → Mn²⁺ in acid is:
  1. A
    5
    Correct
  2. B
    3
  3. C
    2
  4. D
    7

Correct answer

5

Explanation

Mn in MnO₄⁻ is +7. In Mn²⁺ it is +2. Change = 5. So 5 electrons are gained per MnO₄⁻: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O.

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