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Oxidation number of P in PO(4)^(3-), of ...

Oxidation number of P in `PO_(4)^(3-)`, of S in `SO_(4)^(2-)` and that of `Cr_(2)O_(7)^(2-)` are respectively

A

`+3,+6,+5`

B

`+6,+6,+5`

C

`+5,+3,+6`

D

`-3,-5,+6`

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The correct Answer is:
B
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