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NEET levelSingle correct optionDifficulty 1 of 3pn203

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

A2
B0
C1
D3

Answer: A

H X_{3} PO X_{3}

is

OP (H) (OH) X_{2}

. Only the two hydrogens in P-OH groups are ionisable; the P-H hydrogen is not. So it is dibasic.

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