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Question

Which of the following is a tetrabasic acid?


A

Hypophosphorous acid

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B

Metaphosphoric acid

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C

Pyrophosphoric acid

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D

Orthophosphoric acid

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Solution

The correct option is C

Pyrophosphoric acid


Explanation for correct option:

C. Pyrophosphoric acid

  • Pyrophosphoric acid is a diphosphoric acid with a chemical formula H4P2O7.
  • It is soluble in water/ ethyl alcohol as well as diethyl ether.
  • This acid contains four replaceable hydrogens thus it is a tetrabasic acid.
  • The structure of Pyrophosphoric acid is given below:
How many P-O-P bonds are there in in Pyrophosphoric acid? - Q&A

Explanation for incorrect options:

A. Hypophosphorous acid has a chemical formula H3PO2 and it is a dibasic acid due to the presence of two replaceable hydrogens.

B. Metaphosphoric acid has a chemical formula HPO3 and it is a monobasic compound as it has only one replaceable hydrogen.

D. Orthophosphoric acid has a chemical formula H3PO4 and it is a tribasic acid due to the presence of three replaceable hydrogens.

Hence, the correct option is C i.e. Pyrophosphoric acid.


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