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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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