Answers

2016-01-28T22:07:27+05:30
The charge of H2P2O7 is -1. 
And, therefore,
Oxidation number of Hydrogen is +1.
and for Oxygen, it is -2.
H3 gives, +3.
O7 gives -14.

Therefore, 3+2x-14=-1.
2x=10.
Therefore, x=+5.

Therefore,

the Oxidation number of P in H3P2O7 is,
+5.
Thank you.
Hope this will help you.
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2016-01-29T19:43:19+05:30
Oxidation number of P=5.5 
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