An example of dibasic acid is:

orthophosphorus acid

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orthophosphoric acid

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hypophosphorus acid

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pyrophosphoric acid

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Solution

The correct option is B orthophosphorus acid

Dibasic acid is a substance which can donate two protons or hydrogen ( $H^{+}$ ) ions per molecule.
Orthophosporous acid is a dibasic acid as it has 2 number of replaceable hydrogens.
Hence option $A$ is correct.

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N a_{2} H P O_{4}

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