(i) [Ni(CN)4]2–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 s
CN– will cause pairing of electrons. It is diamagnetic in nature due to the unpaired electron.


(ii) [Ni(Cl4)]2–

In case of [NiCl4] 2−, Cl− ion is a weak field ligand. Therefore, it does not lead to the pairing of unpaired 3d electrons. Therefore, it undergoes sp3 hybridization. Since there are 2 unpaired electrons in this case, it is paramagnetic in nature.

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