Which of the following is a dibasic acid?

H_{2} C O_{3}

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H N O_{3}

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H_{3} P O_{4}

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C H_{3} C O O H

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Solution

The correct option is A $H_{2} C O_{3}$
Dibasic acid has two hydrogen ions to donate to a base in a neutralisation reaction. Carbonic acid $H_{2} C O_{3}$ forms 2 hydrogen ions on decomposition, thus its a dibasic acid.

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