What are the basicities of $H_{3} {P O}_{4}$ and $H_{3} {P O}_{3}$ respectively?

2, 3

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1, 2

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3, 3

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3, 2

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Solution

The correct option is D $3, 2$
In oxoacids, the phosphorus is tetrahedrally surrounded by other atoms. these acids contain one $P = O$ , $P - H$ bond and other $P - O H$ bonds which participate for their basicity. $H_{3} P O_{3}$ is dibasic as it has two $P - O H$ bonds and $H_{3} P O_{4}$ is tribasic as it has three $P - O H$ bonds.

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