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Q.

On reduction of KMnO4  by oxalic acid in acidic medium, the oxidation number of  Mn  changes. What is the magnitude of this change?

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a

From 7 to 2

b

From 6 to 2

c

From 7 to 4

d

From 5 to 2

answer is A.

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Detailed Solution

Mn changes  oxidation number from +7 to +2 On reduction of KMnO4 by oxalic acid in acidic medium.MnO4-→Mn2+
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On reduction of KMnO4  by oxalic acid in acidic medium, the oxidation number of  Mn  changes. What is the magnitude of this change?