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What are the oxidation states of phosphorus in the following: (i) H3PO3 (ii) PCl3 (iii) Ca3P2

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What are the oxidation states of phosphorus in the following:

(i) H3PO3

(ii) PCl3

(iii) Ca3P2

(iv) Na3PO4

(v) POF3?

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Let the oxidation state of p be x

(i) H3PO3

3 + x + 3(-2) = 0

3 + x - 6 = 0

x - 3 = 0

x = +3

(ii) PCl3

x + 3(-1) = 0

x - 3 = 0

x = +3

(iii) Ca3P2

3(+2) + 2(x) = 0

6 + 2x = 0

2x = -6

x = -3

(iv) Na3PO4

3(+1) + x + 4(-2) = 0

3 + x - 8 = 0

x - 5 = 0

x = +5

(v) POF3

x + (-2) + 3(-1) = 0

x - 5 = 0

x = +5

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