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  4. The geometry of [ Ni ( CN )4]2- and [ NiCl 4]2- ions are :

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Q. The geometry of $\left[ Ni ( CN )_{4}\right]^{2-}$ and $\left[ NiCl _{4}\right]^{2-}$ ions are :

AFMCAFMC 2003

Solution:

The geometry of $\left[ Ni ( CN )_{4}\right]^{2-}$ is square planar and $\left[ NiCl _{4}\right]^{2-}$ is tetrahedral
$Ni =[ Ar ] 3 d^{8} 4 s^{2}$
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$CN ^{-}$is a strong ligand (crystal field theory) hence it cause the pairing of electron in $Ni ^{2+}$ while $Cl ^{-}$is a weak ligand so it does not cause pairing of electrons
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