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JEE Main levelOne or more correct optionsDifficulty 2 of 3pn099

Select the correct statement(s) about basicity.

A $H X_{4} P X_{2} O X_{7}$ is tetrabasic
B $H X_{3} PO X_{2}$ is monobasic
C $H X_{2} S X_{2} O X_{7}$ is dibasic
D $H X_{3} PO X_{3}$ is tribasic

Answer: A, B, C

Basicity equals the number of ionisable P-OH or S-OH hydrogens:

H X_{4} P X_{2} O X_{7}

has four P-OH,

H X_{3} PO X_{2}

has one,

H X_{2} S X_{2} O X_{7}

has two S-OH.

H X_{3} PO X_{3}

has only two P-OH (one H is on P), so it is dibasic.

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