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  • What is the structure of  in the liquid and solid states? <div class='qna-option

What is the structure of \mathrm{PCl}_5 in the liquid and solid states? 

Option: 1

A mixture of tetrahedral \mathrm{PCl}_4{ }^{+}cations and octahedral \mathrm{PCl}_6{ }^{-} anions
 


Option: 2

A trigonal bipyramidal molecule
 


Option: 3

A tetrahedral molecule
 


Option: 4

An octahedral molecule


Answers (1)

best_answer

The answer is a mixture of tetrahedral \mathrm{PCl}_4{ }^{+} cations and octahedral  \mathrm{PCl}_6^{-} anions. 

In the liquid and solid states, \mathrm{PCl}_5 exists as a mixture of two different ions: the tetrahedral \mathrm{PCl}_4^{+} cation and the octahedral

\mathrm{PCl}_6^{-} anion. The \mathrm{PCl}_4{ }^{+}cation is formed when one of the lone pairs on the phosphorus atom in \mathrm{PCl}_5 is donated to a

chlorine atom. The \mathrm{PCl}_6^{-} anion is formed when one of the \mathrm{P}-\mathrm{Cl} bonds in \mathrm{PCl}_5 is broken, and the chlorine atom gains

an electron.

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Gunjita

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