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Chlorides of Phosphorus

Question

In solid state $P C l_{5}$ is a :

A

covalent solid

B

octahedral structure

C

ionic solid with

[P C l_{6}]^{+}

octahedral and

[P C l_{4}]^{-}

tetrahedral

D

ionic solid with

[P C l_{4}]^{+}

tetrahedral and

[P C l_{6}]^{-}

octahedral

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Solution

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The correct option is D ionic solid with $[P C l_{4}]^{+}$ tetrahedral and $[P C l_{6}]^{-}$ octahedral

In solid state $P C l_{5}$ tries to exist as oppositely charged ions like

(1) $P C l_{4}^{+}$ and (2) $P C l_{6}^{-}$ as the ionic bonding enhances the crystalline nature .

also $P C l_{4}^{+}$ is tetrahedral , while $P C l_{6}^{-}$ 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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