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Question 860007
JEE Chemistry · Hard

d- and f-Block Elements: JEE Main MCQ

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JEE MainHardQuestion 860007

Question

KMnO₄ acts as oxidising agent in acidic, neutral, and basic media but gives different products. In basic medium, Mn goes from +7 to:
  1. A
    +6 (manganate MnO₄²⁻)
    Correct
  2. B
    +2 (Mn²⁺)
  3. C
    +4 (MnO₂)
  4. D
    0 (Mn)

Correct answer

+6 (manganate MnO₄²⁻)

Explanation

KMnO₄ reductions: Acidic → Mn²⁺ (+2, 5e⁻ per Mn). Neutral/weakly basic → MnO₂ (+4, 3e⁻). Strongly basic → MnO₄²⁻ (+6, 1e⁻). Acidic conditions give strongest oxidation, used most in volumetric analysis.

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