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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.