1.

Geometrical shapes of the complexes formed by the reaction of Ni^(2+) with Cl^(-), CN^(-) and H_(2)O respectively are

Answer»

octahedral, tetrahedral and SQUARE planar
tetrahedral, square planar and octahedral
square planar, tetrahedral and octahedral
octahedra, square planar and octahderal.

Solution :`Ni^(2+)+Cl^(-)+ Cl^(-)to[NiCl_(4)]^(2-) sp^(3)` hybridisationm, it is tetrahedral.
`Ni^(2+)+CN^(-)to[Ni(CN)_(4)]^(2-), dsp^(2)` hybridisation it is square planar.
`Ni^(2+)+H_(20Oto[Ni(H_(2)O)_(6)]^(2+), sp^(3)d^(2)` hybridisation, it is octahedral.


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