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Oxidation numbers of P in PO4^(3-), of ...

Oxidation numbers of P in ` PO_4^(3-)`, of S in ` SO_4^(2-)`, and that of `Cr` in ` Cr_2O_7^(2-)` are respectively ,

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The correct Answer is:
1
`PO_(4)^(3-) =x+ (-2) =-3, x-8 =-3, x=+5`
`Cr_(2)O_(7)^(2-) = 2x + 7(-2) =-2, 2x-14=-2`,
`2x =12, x=+6`
Ratio `=(+6)/(+6) =1`
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