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

1. SiCl4, PCl4+
2. diamond, silicon carbide
3. NH3, PH3
4. XeF4, XeO4

Correct answer: XeF4, XeO4

Solution

XeF4 is square planar, while XeO4 is tetrahedral, so they are not isostructural. The other pairs have the same geometry.

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