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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

`+5,+6 and +6`

B

`+3,+6 and +5`

C

`+5,+3 and +6`

D

`-3,+6 and +6`

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The correct Answer is:
A
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