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When KMnO(4) is reduced with oxalic acid...

When `KMnO_(4)` is reduced with oxalic acid in acidic solution, the oxidation number of `Mn` changes from

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On reduction of KMnO_(4) by oxalic acid in acidic medium, the oxidation number of Mn. What is the magnitude of is change?

In acidic medium oxidation state of Mn changes from

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