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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn215

Select the correct statement(s) about oxoacids of phosphorus.

A $H X_{3} PO X_{3}$ contains one P-H bond.
BOn heating, $H X_{3} PO X_{3}$ disproportionates to $H X_{3} PO X_{4}$ and $PH X_{3}$ .
C $H X_{3} PO X_{2}$ is dibasic.
D $H X_{4} P X_{2} O X_{7}$ contains one P-O-P linkage.

Answer: A, B, D

H X_{3} PO X_{3}

has one P-H and two P-OH groups.

H X_{3} PO X_{2}

has only one P-OH group, so it is monobasic.

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

is

(HO) X_{2} OP - O - PO (OH) X_{2}

with one P-O-P link. Heating gives

4 H X_{3} PO X_{3} 3 H X_{3} PO X_{4} + PH X_{3}

.

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