Q .     In the reduction of `KMnO_4` by warm acidified
oxalic acid, the oxidation number of `Mn`
changes from

UPSEE 2012
A

`+4 ` to `+2`

B

`+6 ` to `+4`

C

`+7 ` to `+2`

D

`+7 ` to `+4`

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