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  • 22. Calculate the oxidation number of phosphorus in the following species. (a) HPO _3^2-

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

Answers (1)

(a) HPO_{3}^{2-}

Let us consider the oxidation number of phosphorus to be x.

 

+1 + x + (-2) \times 3 = -2

+1 + x - 6 = -2

X -5 = -2

X = -2 +5

X = +3

Thus, O.S. of phosphorous is +3.

 

(b) PO_{4}^{3-}

x + (-2) \times 4 = -3

x-8 = -3

x = -3 +8

x = +5

Thus, O.S. of phosphorous in this ion is +5.

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