Which of the following is a tribasic 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 C
$H_{3} P O_{4}$

Tribasic acid has three hydrogen ions to donate to a base in a neutralisation reaction. Phosphoric acid $H_{3} P O_{4}$ forms 3 hydrogen ions on decomposition, thus its a tribasic acid.

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