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JEE Main levelSingle correct optionDifficulty 2 of 3pn210

Assertion (A): $H X_{3} PO X_{3}$ is a dibasic acid. Reason (R): Only the hydrogens present in P-OH groups are ionisable, and $H X_{3} PO X_{3}$ has two such groups.

AA is false but R is true
BBoth A and R are true and R is the correct explanation of A
CA is true but R is false
DBoth A and R are true but R is not the correct explanation of A

Answer: B

H X_{3} PO X_{3}

is

OP (H) (OH) X_{2}

. The P-H hydrogen does not ionise, and the two P-OH hydrogens do, so basicity is 2. R states exactly this, so it explains A.

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