Question

In solid state PCl5 is a :

A
covalent solid
B
octahedral structure
C
ionic solid with [PCl6]+ octahedral and [PCl4] tetrahedral
D
ionic solid with [PCl4]+ tetrahedral and [PCl6] octahedral
Solution
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The correct option is D ionic solid with [PCl4]+ tetrahedral and [PCl6] octahedral

In solid state PCl5 tries to exist as oppositely charged ions like

(1) PCl+4 and (2) PCl6 as the ionic bonding enhances the crystalline nature .

also PCl+4 is tetrahedral , while PCl6 is octahedral . these structure fit well into each other which gives more stability to solid structure .

Hence option D is correct.

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