Which of the following is a tetrabasic acid (A) Hypophosphorous acid (B) Metaphosphoric acid (C) Pyrophosphoric acid (D) Orthophosphoric acid

Acids having 4 replaceable hydrogen atoms is known as tetrabasic acids

Pyrophosphoric acid (H4P2O7) contains four replaceable H-atoms. Hence, H4P2O7 is a tetrabasic acid.

Hence, the correct option is (C)

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