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How does PCl5 exist in its solid state?(a) [PCl4]^+[PCl6]^–(b) [PCl3]^2+[PCl7]^2-(c) [PCl2]^3+[PCl8]^3-(d) [PCl5][PCl5]This question was addressed to me in an internship interview.Asked question is from P-Block Elements in chapter P-Block Elements of Chemistry – Class 12

Answer»

Right choice is (a) [PCl4]^+[PCl6]^–

For EXPLANATION I would SAY: PHOSPHORUS pentachloride is a pale yellow crystalline solid with a characteristic PUNGENT smell. In the solid state, it exists as an IONIC solid, [PCl4]^+[PCl6]^– in which the cation, [PCl4]^+ is tetrahedral while the anion, [PCl6]^– is octahedral.



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