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Question:

The pair that contains two P−H bonds in each of the oxoacids is:

H4P2O5andH4P2O6

H3PO2andH4P2O5

H4P2O5andH3PO3

H3PO3andH3PO2

Solution:

H3PO2 and H4P2O5 contain 2 P−H bonds as shown in the structure. So, option B is correct.