In pyrophosphoric acid,the number of hydroxyl | vedclass

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(C) The chemical formula of pyrophosphoric acid is $H_4P_2O_7$.Its structure consists of two $P(=O)(OH)_2$ units linked by an oxygen atom,represented

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$4$

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(C) The chemical formula of pyrophosphoric acid is $H_4P_2O_7$.Its structure consists of two $P(=O)(OH)_2$ units linked by an oxygen atom,represented as $(HO)_2P(=O)-O-P(=O)(OH)_2$.By observing the structure,we can count the number of hydroxyl $(-OH)$ groups attached to the phosphorus atoms.There are $4$ hydroxyl groups present in the molecule.

In pyrophosphoric acid,the number of hydroxyl groups is

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