1.

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

Answer»

`PCl_(4)^(+) and SiCl_(4)`
`PF_(5) and BrF_(5)`
`AlF_(6)^(3-) and SF_(6)`
`CO_(3)^(2-) and NO_(3)^(-)`

Solution :`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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