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Phosphorus pentachloride is ionic in...

Phosphorus pentachloride is ionic in

A

vapour state

B

liquid state

C

solid state

D

all the three states

Text Solution

Verified by Experts

The correct Answer is:
3
In geseous and liquids phases,It is covalent consisting of trigonal bipyramidal molecules.In the solid state it exists as an ionic solid `[PCl_(4)]^(+) [PCl_(6)]^(-)` in which the cation, `[PCl_(4)]^(+)` is tetrahedral and the anion,`[PCl_(6)]` is octahedral.
`2PCl_(5)(g)rarr[PCl_(4)]^(+)[PCl_(6)]^(-)`
Teh driving force behind this transformation is the stability attained when an unsymmertrical geometry (trigonal bipyramidal)is transformed into symmertrical geometries (tetrahedral )and octahedral.
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