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Which one of the following has a square ...

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-)`

Text Solution

Verified by Experts

The correct Answer is:
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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Knowledge Check

  • Which of the following has a square planar geometry? .

    A
    `[PtCl_(4)]^(2-)`
    B
    `[CoCl_(4)]^(2-)`
    C
    `[FeCl_(4)]^(2-)`
    D
    `[Ni(CN)_(4)]^(2-)`

  • Which one of the following has a square planar geometry ? [At. no. Co=27, Ni=28, Fe=26, Pt=78]

    A
    `[NiCl_(4)]^(2-)`
    B
    `[PtCl_(4)]^(2-)`
    C
    `[CoCl_(4)]^(2-)`
    D
    `[FeCl_(4)]^(2-)`

  • Which one of the following has a square planar geometry ? [At. no. Co=27, Ni=28, Fe=26, Pt=78]

    A
    `[NiCl_(4)]^(2-)`
    B
    `[PtCl_(4)]^(2-)`
    C
    `[CoCl_(4)]^(2-)`
    D
    `[FeCl_(4)]^(2-)`

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    Which of the following species has square planar geometry ?

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