In which of the following pairs, both the species are not isostructura

1.	In which of the following pairs, both the species are not isostructural-
Answer» `SiCl_(4),PC l_(4)^(+)` diamond, SiC `NH_(3),PH_(3)` `XeF_(4),XeO_(4)` SOLUTION :(i) (ii) Diamond and SILICON carbide `(SiC)` BOND are isostructural because their CENTRAL atom is `sp^(3)` hybridised and both have tetrahedral arrangement. (iii) Both `NH_(3)` and `PH_(3)` have pyramidal GEOMETRY. (iv) `XeF_(4)` has `sp^(3)d^(2)` hybridisation while `XeO_(4)` has `sp^(3) ` hybridisation. Hence, `XeF_(4) and XeO_(4)` are not isostructural.

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