1.

In which pair both are not isostructural :-

Answer»

`BH_(4)^(-) & AlH_(4)^(-)`
`NH_(4)^(+) & PH_(4)^(+)`
`PCl_(6)^(-) & [SiF_(6)]^(-2)`
`BCl_(4)^(-) & I Cl_(4)^(-)`

Solution :`underset("tetrahedral")underset("lp"=0)underset(sp^(3))(BCl_(4)^(-))"" underset("square PLANAR")underset("lp"=2)underset(sp^(3)d^(2))(ICl_(4)^(-))`


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