Question

# Which one of the following is dibasic acid?

A

${\mathrm{H}}_{3}{\mathrm{PO}}_{4}$

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B

${\mathrm{H}}_{3}{\mathrm{BO}}_{3}$

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C

${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$

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D

${\mathrm{H}}_{3}{\mathrm{AsO}}_{4}$

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Solution

## The correct option is C ${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$Explanation for the correct option:(c ) ${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$ It has $2\mathrm{OH}$ groups.${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$ is a diabasic acid Hence this option is correctExplanation for the incorrect options:(a) ${\mathrm{H}}_{3}{\mathrm{PO}}_{4}$ it has $3\mathrm{OH}$ groups.${\mathrm{H}}_{3}{\mathrm{PO}}_{4}$ is a tribasic acid Hence this option is not correct(b)${\mathrm{H}}_{3}{\mathrm{BO}}_{3}$ it has $3\mathrm{OH}$ groups.${\mathrm{H}}_{3}{\mathrm{BO}}_{3}$ is a tribasic acid Hence this option is not correct(d) ${\mathrm{H}}_{3}{\mathrm{AsO}}_{4}$ it has $3\mathrm{OH}$ groups.${\mathrm{H}}_{3}{\mathrm{AsO}}_{4}$ is a tribasic acid Hence this option is not correctHence the correct option is (c ) ${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$

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