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MolSynapse / Question bank / p-Block Elements: Groups 15 and 16 / Phosphorus allotropes, phosphine, halides and oxyacids of phosphorus

JEE Main levelSingle correct optionDifficulty 2 of 3pn138

Pyrophosphoric acid, $H X_{4} P X_{2} O X_{7}$ , has (number of P-O-P linkages, basicity, oxidation state of P) equal to

A1, 4, +3
B1, 2, +5
C2, 4, +5
D1, 4, +5

Answer: D

It is formed by

2 H X_{3} PO X_{4} H X_{4} P X_{2} O X_{7} + H X_{2} O

, so two PO4 units share one bridging O (one P-O-P bond). Four OH groups make it tetrabasic, and P is +5.

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