Which of the following is a tetrabasic acid

Orthophosphorus acid

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Orthophosphoric acid

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Metaphosphoric acid

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Pyrophosphoric acid

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Solution

The correct option is D
Pyrophosphoric acid

$H_{4} P_{2} O_{7}$ pyrophosphoric acid

$H O - O | | P | | O H - O - O | | P | | O H - O H$

Tetrabasic (4 - OH~ groups)

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