1.

Which of the following is not formed on hydrolysis of PCl5?(a) POCl3(b) H3PO4(c) HCl(d) PCl3I got this question in an interview.The question is from P-Block Elements in section P-Block Elements of Chemistry – Class 12

Answer»

Correct answer is (d) PCl3

The best explanation: In moist air, phosphorus PENTACHLORIDE undergoes hydrolysis to first FORM POCL3 and then FINALLY phosphoric acid.

PCl3 + H2O → POCl3 + 2HCl

POCl3 + 3H2O → H3PO4 + 3HCl

However, with excess of water, PCl5 reacts violently to form H3PO4 and HCl.

PCl5 + 4H2O (excess) → H3PO4 + 5HCl.



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