MCQ
The solid phosphorous pentachloride exists
- A$PCl_5$
- B$PCl_4 ^+ \,Cl^-$
- C$PCl_6^-$
- ✓$PCl_4^+\, PCl_6^-$
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$(I)$ Ionization energy $(II)$ Ionic radius
$(III)$ Bond energy of the $X_2$ molecule $(IV)$ Enthalpy of vaporisation