Which of the following is a mono basic acid?

H_{2} S O_{4}

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C H_{3} C O O H

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H_{3} P O_{3}

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H_{2} C O_{3}

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Solution

The correct option is B $C H_{3} C O O H$
Basicity of an acid is determined by the number of ionisable hydrogen atoms in the molecule.

$C H_{3} C O O H ⟶ C H_{3} C O O^{-} + H^{+}$

In acetic acid, $C H_{3} C O O H$ , there is only one ionisable hydrogen atom present and so its basicity is 1, hence it is monobasic.

Hence, option B is correct.

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