Read the following short write-up and an...

Read the following short write-up and answer the questions at the end of it.
In certain polar solvents `PCl_(5)` undergoes an ionisation reaction in which `Cl^(-)` ion leaves one `PCl_(5)` molecule and attach itself to another.
`2PCl_(5)rarrPCl_(4)^(+)+PCl_(6)^(-)`
Select incorrect statement(s).

`PCl_(5)` has `sp^(3)d^(2)` hybridisation

Hybridisation changes from `sp^(3)d` to `sp^(3)d^(2)` in `(PCl_(6)^(-))` and to `sp^(3)` in `(PCl_(4)^(+))`

Structure changes from trigonal bipyramidal to tetrahedral in `(PCl_(4)^(+))` and octahedral in `(PCl_(6)^(-))`

ClPCl (in `PCl_(4)^(+)`) `<` ClPCl (largest angle in `PCl_(6)^(-)`)

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The correct Answer is:

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Read the following short write-up and answer the questions at the end of it. In certain polar solvents PCl_(5) undergoes an ionisation reaction in which Cl^(-) ion leaves one PCl_(5) molecule and attach itself to another. 2PCl_(5)rarrPCl_(4)^(+)+PCl_(6)^(-) Number of lone pairs around phosphorus in PCl_(5),PCl_(4)^(+) and PCl_(6)^(-) are respectively :

0, 1, 2

0, 0, 0

1, 2, 3

0, 2, 1

`DeltaH = DeltaU`

`DeltaH gt DeltaU`

`Delta lt DeltaU`

None of the above

Zero

`+1`

`-1`

Infinite