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

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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,+6and+5`
B. `+5,+3and+6`
C. `+3,+6and+6`
D. `+5,+6and+6`
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`PO_(4)^(3-),X+4(-2)=-3`
`X=+5`
`SO_(4)^(2-),X+4(-2)=-2`
X=+6
`Cr_(2)O_(7)^(2-),2X+7(-2)=-2`
X=-2
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