The oxidation number of P in PO4^(3-), o...

The oxidation number of P in `PO_4^(3-)`, of S in `SO_4^(2-)` and that of Cr in `Cr_2O_7^(2-)` are respectively_______.

A

`-3, +6` and `+6`

B

`+5,+6` and `+6`

C

`+3,+6` and `+5`

D

`+5, +3` and `+6`

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