JEE Advanced Chemistry question

Statement 1: PCl5 is covalent in gaseous and liquid states but ionic in solid state Statement 2: PCl5 in solid state consists of tetrahedral PCl4+ cation and octahedral PCl6- anion

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for AssertionCorrect
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (B)

Solution

PCl5 is a covalent, trigonal-bipyramidal (sp3d) molecule in the gas and liquid phases, but exists in the solid state as the ionic lattice [PCl4]+[PCl6]⁻ (tetrahedral cation, octahedral anion), making both statements individually true facts. However, Statement 2 only describes the solid-state ionic arrangement — it

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Question ID VK-159281