Geometrical shapes of the complexes formed by the reaction of Ni 2+ with Cl - , CN - and H 2 O, respectively, are
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Ni 2+ + 4CN - 
[Ni(CN) 4 ] 2-
Here Ni 2+ has d 8 -configuration with CN - as strong ligand.
d 8 -configuration in strong ligand field gives dsp 2 hybridisation, hence square planar geometry.
Ni 2+ + 4C1 - 
[NiCl 4 ] 2-
Here Ni 2+ has d 8 -configuration with Cl - as weak ligand.
d 8 -configuration in weak ligand field gives sp 3 hybridisation, hence tetrahedral geometry.
Ni 2+ with H 2 O forms [Ni(H 2 O) 6 ] 2+ complex and H 2 O is a weak ligand.
Therefore, [Ni(H 2 O) 6 ] 2+ has octahedral geometry.
In octahedral complexes with d 8 configuration, there is always sp 2 d 2 hybridisation (outer orbital complex) irrespective of strong ligand field or weak ligand field.
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