If KMnO₄ is reduced by oxalic caid, in an acidic medium, then oxidation number of Mn changes from

If KMnO₄ is reduced by oxalic caid, in an acidic medium, then oxidation number of Mn changes from

(a) 4 to 2
(b) 7 to 2
(c) 6 to 4
(d) 7 to 4

7 to 2

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