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Question

Which of the following has square planar geometry?

A
[CoCl4]2
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B
[FeCl4]2
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C
[NiCl4]2
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D
[PtCl4]2
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Solution

The correct option is D [PtCl4]2
Pt2+ ion has the configuration 5d8
i.e.,
Cl is a weak ligand but causes pairing of electrons in 5d, making one 5d orbital available. This gives dsp2 hybridisation and square planar geometry.

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