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Calculate the oxidation number of phosph...

Calculate the oxidation number of phosphorus in the following species.
(a) `HPO_(3)^(2-)``" "`(b)`PO_(4)^(3-)`

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(a) Let the O.N of P in `HPO_(3)` be x `therefore` 1+x+3(-2)=-2 or x=+3
(b) Let the O.N of P in `PO_(4)^(3-)` be x `therefore` x+4(-2)=-3 or x=+5
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