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[Ni(CN)(4)]^(2-) is diamagnetic while [C...

`[Ni(CN)_(4)]^(2-)` is diamagnetic while `[Cr(NH_(3))_(6)]^(3+)` is paramagnetic. Explain.

Text Solution

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In `[Ni(CN)_(4)]^(2-)` complex ion, the oxidation state of nickel is `+2`, and `CN^(-)` is a strong ligand.
Electronic configuration : `Ni^(2+)" "[Ar]" "3d^(8)`

Due to strong field ligands `CN^(-)`, there is pairing of two unpaired electrons, and hence `Ni^(2+)` in the complex does not have an unpaired electron but all electrons are paired, hence it is diamagnetic.
(2) In `[Cr(NH_(3))_(6)]^(3+)` complex ion, the oxidation state of chromium is `+3` and `NH_(3)` is a strong ligand.
Electronic configuration : `Cr^(3+)" "[Ar]" "3d^(3)`
In the complex ion, due to strong `NH_(3)` ligands, two electrons are paird but one electron remains unpaired hence the complex is paramagnetic.
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[Co(NH_(3))_(6)]^(3+) & [CoF_(6)]^(3-) both are complexes of Co(III), but [Co(NH_(3))_(6)]^(3+) is diamagnetic while [Co(F_(6)]^(3-) is paramagnetic with mu=4.90 BM . Explain.

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Knowledge Check

  • Give reason for the statement [Ni(CN)_(4)]^(2-) is diamagnetic while [NiCl_(4)]^(2-) is paramagnetic in nature .

    A
    In `[NiCl_(4)]^(2-)` no unpaired electrons are present while in `[Ni(CN)_(4)]^(2-)` two unpaired electrons are present
    B
    In `[Ni(CN)_(4)]^(2-)` , no unpaired electrons are present while in `[NiCl_(4)]^(2-)` two unpaired electrons are present .
    C
    `[NiCl_(4)]^(2-)` shows `dsp^(2)` hybridisation hence it is paramagnetic .
    D
    `[Ni(CN)_(4)]^(2-)` shows `sp^(3)` hybridisation hence it is diamagnetic .

  • The complex []Ni(CN)_(4)]^(2-) is diamagnetic and the complex [NiCl_(4)]^(2-) is paramagnetic . What can you conclude about their molecular geometries ?

    A
    Both complexes have square planar geometries
    B
    Both complexes have tetrahedral geometries
    C
    `[NiCl_(4)]^(2-)` has a square planar geometry while `[Ni(CN)_(4)]^(2-)` has a tetrahedral geometry .
    D
    `[NiCl_(4)]^(2-)` has a tetrahedral geometry while `[Ni(CN)_(4)]^(2-)` has a square planar geometry .

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