Phosphoric acid is a :

Dibasic acid

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tribasic acid

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diacidic base

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triacidic base

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Solution

The correct option is D tribasic acid
The $P - H$ bond is not ionizable to give $H^{+}$ only those $H$ atoms which are attached to oxygen in $P - O H$ form are ionizable and causes basicity.

$H_{3} P O_{4} ⟶ 3 H^{+} + P O_{4}^{3 -}$
Phosphoric Hydrogen Phosphate
acid ion ion

Since phosphoric acid has three ionizable hydrogen atoms, it is tribasic in nature.

Hence, option B is the correct answer.

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