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In which of the following pairs, the two...

In which of the following pairs, the two species are not isostructural?

A

`PCl_(4)^(+) and SiCl_(4)`

B

`PF_(5) and BrF_(5)`

C

`AlF_(6)^(3-) and SF_(6)`

D

`CO_(3)^(2-) and NO_(3)^(-)`

Text Solution

Verified by Experts

The correct Answer is:
B
`PF_(5) (sp^(3)d)` has trigonal bipyramidal geometry while `BrF_(5) (ds^(3)d^(2))` has square pyramidal or distorted octahedral geometry. All the remaining have the same structure : `PCl_(4)^(+), SiCl_(4)` (tetrahedral) `sp^(3) , AlF_(6)^(3-) and SF_(6)` (octahedral, `sp^(3)d^(2)`) and `CO_(3)^(2-) and NO_(3)^(-)` (trigonal planar, `sp^(2)`).
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