(B) The chemical formula of pyrophosphoric acid is $H_4P_2O_7$.The structure consists of two $P=O$ groups and an $O-P-O-P-O$ backbone,where each phosp

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(B) The chemical formula of pyrophosphoric acid is $H_4P_2O_7$.The structure consists of two $P=O$ groups and an $O-P-O-P-O$ backbone,where each phosphorus atom is bonded to two hydroxyl $(-OH)$ groups.The structure is $(HO)_2P(O)-O-P(O)(OH)_2$.Therefore,there are $4$ hydroxyl groups present in the molecule.