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Question

In the solid state PCl5 exists as:
  1. [PCl4] and [PCl6]+ ions
  2. covalent PCl5 molecules only
  3. [PCl4]+ and [PCl6] ions
  4. covalent P2Cl10 molecules only

A
covalent PCl5 molecules only
B
covalent P2Cl10 molecules only
C
[PCl4] and [PCl6]+ ions
D
[PCl4]+ and [PCl6] ions
Solution
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In the solid state, PCl5 prefers to exist as oppositely charged ion like [PCl4]+ and [PCl6] as ionic bonding enhances the crystalline nature. The shape is more stable in the ionic form as it forms the tetrahedral and octahedral shape.

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