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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds3 Marks
Question
Explain the hybridisation of $\left[ Ni ( CN )_4\right]^{2-}$ complex using valance bond theory and also describes its geometry and nature.
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Answer

Hybridization of $\left[ Ni ( CN )_4\right]^{2-}$ (VBT)
In $\left[ Ni ( CN )_4\right]^{2-}$, the central metal is $Ni ^{2+}$ with a $[ Ar ] 3 d^8$ configuration. $CN ^{-}$is a strong field ligand, which forces the unpaired electrons in the $3 d$ orbitals to pair up. This leaves one $3 d$, one $4 s$, and two $4 p$ orbitals vacant for hybridization.
- Hybridization: $d s p^2$
- Geometry: Square Planar
- Magnetic Nature: Diamagnetic (due to all paired electrons)

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