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Solid $PCl_5$ exist as:

A$[PCl_4]^+$ and $[PCl_6]^-$
B$PCl_3$ and $Cl_2$
C$[PCl_4]^-$ and $[PCl_6]^+$
D$[PCl_3]^+$ and $[PCl_3]^-$
Answer & Solution
Correct answer: A. $[PCl_4]^+$ and $[PCl_6]^-$
In the solid state, $PCl_5$ is ionic and exists as $[PCl_4]^+$ and $[PCl_6]^-$ ions. This arrangement stabilizes the compound in the crystal lattice. **Hence option A is correct.**
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