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NEET levelSingle correct optionDifficulty 1 of 3pn092

The basicity of phosphorous acid, $H X_{3} PO X_{3}$ , is

A2
B1
C4
D3

Answer: A

H X_{3} PO X_{3}

has two P-OH groups and one P-H bond. Only the hydrogens of the P-OH groups ionise, so it is dibasic.

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