Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)`A. (a) `[CoCl_4]^(2-)`B. (b) `[FeCl_4]^(2-)`C. (c) `[NiCl_4]^(2-)`D. (d) `[PtCl_4]^(2-)`

Which one of the following has a square planar geometry? `(Co=27, Ni=2

1.	Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)`A. (a) `[CoCl_4]^(2-)`B. (b) `[FeCl_4]^(2-)`C. (c) `[NiCl_4]^(2-)`D. (d) `[PtCl_4]^(2-)`
Answer» Correct Answer - D `Cl^(-)` is weak field ligand and so chloride complexes are mostly high spin, but CFSE for transition metals is in the order `3dlt4dlt5d`, so the metal belonging to higher series will prefer low spin complex. Among the given complexes, `Pt` forms low spin complex while others form high spin complex. Square planar geometry of `[PtCl_4]^(2-)` is also supported by its diamagnetic nature. Note: All the complexes of Pd (II) ad Pt (II) are square planar.

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Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)`A. (a) `[CoCl_4]^(2-)`B. (b) `[FeCl_4]^(2-)`C. (c) `[NiCl_4]^(2-)`D. (d) `[PtCl_4]^(2-)`

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