In which of the following pairs, both the species are not isostructural? [2015]

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Solution

Q.
In which of the following pairs, both the species are not isostructural [2015]

1 Diamond, Silicon carbide

2 ${NH}_{3}, {PH}_{3}$

3 ${XeF}_{4}, {XeO}_{4}$

4 ${SiCl}_{4}, {PCl}_{4}^{+}$

Ans.
(3)

In diamond and silicon carbide, central atom is $s p^{3}$ hybridised and hence, both are isostructural.

$N H_{3}$ and $P H_{3}$ , both are pyramidal and central atom in both cases is $s p^{3}$ hybridised. $S i C l_{4}$ and $P C l_{4}^{+}$ , both are tetrahedral and central atom in both cases is $s p^{3}$ hybridised.

In $X e F_{4}$ , Xe is $s p^{3} d^{2}$ hybridised and structure is square planar, while in $X e O_{4}$ , Xe is $s p^{3}$ hybridised and structure is tetrahedral.

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