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JEE Advanced2011Chemistryd and f Block ElementsActual

Reduction of the metal centre in aqueous permanganate ion involves

Options

  1. Athree electrons in neutral medium
  2. Bfive electrons in neutral medium
  3. Cthree electrons in alkaline medium
  4. Dfive electrons in acidic medium

Correct answer

A. three electrons in neutral medium

Step-by-step solution

In neutral medium: MnO ₄⁻ MnO ₂ ( Mn ⁷⁺+3 e⁻ Mn ⁴⁺ ) In alkaline medium : MnO ₄⁻ MnO ₂ ( Mn ⁷⁺+3 ⁻ Mn ⁴⁺ ) In acidic medium : Mn ₄⁻ Mn ²⁺ ( Mn ⁷⁺+5 e⁻ Mn ²⁺ )

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