Q 2504412358.     In the equation `CrO_4^(2-) +SO_3^(2-) -> Cr(OH)_4^(-) +SO_4^(2-)` the oxidation number of `Cr` changes from

UPSEE 2008
A

`+ 6` to `+ 4`

B

`+ 6` to `+ 3`

C

`+ 8` to `+ 4`

D

`+ 4` to `+ 3`

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