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Oxidation states of P in H4P2O5, H4P2O6,...

Oxidation states of P in `H_4P_2O_5, H_4P_2O_6, H_4P_2O_7` are respectively

A

`+3,+5,+4`

B

`+5,+3,+4`

C

`+5,+4,+3`

D

`+3,+4,+5`

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