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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn053

Which of the following statements about the oxyacids of phosphorus are correct?

A $H X_{4} P X_{2} O X_{7}$ contains a P-O-P linkage and is tetrabasic.
B $H X_{3} PO X_{2}$ contains one P-H bond.
C $H X_{4} P X_{2} O X_{6}$ contains a P-P bond and phosphorus in the +4 state.
D $H X_{3} PO X_{3}$ is dibasic and acts as a reducing agent.

Answer: A, C, D

H X_{3} PO X_{3}

has two P-OH groups and one P-H (reducing, P at +3).

H X_{3} PO X_{2}

has two P-H bonds, so the second statement is false.

H X_{4} P X_{2} O X_{6}

has a P-P bond with P at +4.

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

has a P-O-P bridge and four P-OH groups. Correct: A, C, D.

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