JEE Advanced 2011 Chemistry question

Reduction of the metal centre in aqueous permanganate ion involves

(A)3 electrons in neutral mediumCorrect
(B)5 electrons in neutral medium
(C)3 electrons in alkaline mediumCorrect
(D)5 electrons in acidic mediumCorrect

Answer: (A),(C),(D)

Solution

Mn is +7 in . In acidic medium: , a change from +7 to +2: 5 electrons (D true). In neutral or (weakly) alkaline medium: , a change from +7 to +4: 3 electrons (A and C true). (B) is

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Question ID VK-025952