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Question 31

What are the oxidation states of phosphorus in the following:

(i) H3PO3

(ii) PCl3

(iii) Ca3P2

(iv) Na3PO4

(v) POF3?

Answer

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  = -6 / 2

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 - 2 - 3  = 0

x  - 5  = 0 

x = 5

 

 

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