Geometrical shapes of the complexes formed by the reaction of N i 2 + w i t h C l - , C N - a n d H 2 O , respectively, are

Step-by-step solution

N i 2 + + 4 C N - → N i C N 4 2 - Here N i 2 + has d 8 -configuration with C N - as strong ligand. d 8 -configuration in strong ligand field gives dsp 2 hybridisation, hence square planar geometry. N i 2 + + 4 C l - → N i C l 4 2 - Here N i 2 + has d 8 -configuration with C l - as weak ligand. d 8 -configuration in weak ligand field gives s p 3 hybridisation, hence tetrahedral geometry. N i 2 + with H 2 O forms N i H 2 O 6 2 + complex and H 2 O is a weak ligand. Therefore, N i H 2 O 6 2 + has octahedral geometry. I