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  4. In solid state, PCl5 exists as an ionic solid [PClX]+ [PClY]-. What is the value of Y?

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Q. In solid state, $PCl_{5}$ exists as an ionic solid $\left[PCl_{X}\right]^{+ }\left[PCl_{Y}\right]^{-}.$ What is the value of $Y?$

NTA AbhyasNTA Abhyas 2022

Solution:

In solid state, $PCl_{5}$ exists as $\left[PCl_{4}\right]^{+}\left[PCl_{6}\right]^{-}.$
The geometry of the $PCl_{5}$ is the trigonal bipyramidal. The geometry of the $\left[PCl_{4}\right]^{+}$ ion is tetrahedral. The geometry of the $\left[PCl_{6}\right]^{-}$ ion is the octahedral.
Hence, $Y$ is $6.$