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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 3pn134

Phosphorus pentachloride is treated with an excess of hot water. The phosphorus-containing product is

A $POCl X_{3}$
B $H X_{3} PO X_{4}$
C $PH X_{3}$
D $H X_{3} PO X_{3}$

Answer: B

With limited water PCl5 gives POCl3, but with excess water hydrolysis is complete:

PCl X_{5} + 4 H X_{2} O H X_{3} PO X_{4} + 5 HCl

. P stays in the +5 state, so the product is H3PO4.

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