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Explain on the basis of valence bond theory that [NI(CN)4]2- ion with square planar structure is diamagnetic and the [NI(CN)4]2- ion with tetrahedral geometry is paramagnetic.

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Nickel in [NI(CN)4]2- is in the +2 oxidation state, i.e. nickel is present as Ni2+ ion. dsp2 – hybrid orbitals

CN- is a strong ligand as it approaches the metal ion, So the electrons should getd paired up.

In [NI(CN)4]2- , Cl- provides a weak ligand field. It is therefore unable to pair up the unpaired electrons of the 3d orbital.

Hence the hybridisation is sp3 , and it is paramagnetic

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