Question

on basis of valence bond theory explain the geometry and magnetic behaviour of (Ni(CN)4)-2
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Answer 1

Explain on the basis of valence bond theory that [Ni(CN)4]2– ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic. Ni is in the +2 oxidation state i.e., in d8 configuration. There are 4 CN− ions. Thus, it can either have a tetrahedral geometry or square planar geometry.

Answer 2

Explanation:

In the complex [Ni(CN)

4

]

2−

, the central Ni metal has +2 oxidation state with outer electronic configuration 3d

8

. One 3d, one 4s and two 4p orbitals undergo dsp

2

hybridisation. Since, inner d orbital is used in the hybridsation, the complex is inner orbital or low spin or spin paired complex.