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Which one of the following complexes has square planar geometry?

1. [PtCl4]2−
2. [CoCl4]2−
3. [FeCl4]2−
4. [NiCl4]2−

Correct answer: [PtCl4]2−

Solution

[PtCl4]2− has a square planar geometry due to the presence of a d8 electron configuration in platinum, which allows for this arrangement to minimize electron pair repulsion and achieve stability.

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