In the solid state,$PCl_5$ exists as which of the following?
- A$[PCl_4]^-$ and $[PCl_7]^-$ ions
- BCovalent $PCl_5$ molecules
- C$[PCl_4]^+$ and $[PCl_6]^-$ ions
- D$[PCl_3]^{2-}$ and $[PCl_5]^{2+}$ ions
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