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Question

The no. of hydroxyl group in pyrophosphoric acid is:

A
3
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B
4
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C
5
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D
7
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Solution

The correct option is B 4

Pyrophosphoric acid, also known under the name diphosphoric acid,with a chemical formula H4O7P2 is colorless, odorless, hygroscopic and is soluble in water, diethyl ether, and ethyl alcohol.


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