Which one of the following is dibasic acid?

H₄P₂O₇

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H₃PO₃

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H₃PO₄

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H₃PO₂

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Solution

The correct option is B
H₃PO₃

The basicity depends on the number of ionisable hydrogen atom.H₃PO₃ contains 2 ionisable hydrogen atoms.

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H_{3} P O_{2}, H_{3} P O_{4}, H_{3} P O_{3}

H_{4} P_{2} O_{6}

Why $H_{3} P O_{4}$ is a tribasic and $H_{3} P O_{3}$ is a dibasic acid?

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H_{3} P O_{3}

H_{3} P O_{4}

For $H_{3} P O_{3}$ and $H_{3} P O_{4}$ the correct choice is

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