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When the strong ligand CN- is present, electron pairing will take place in:

1. Ni2+ with electronic configuration [Ar]3d8, 4s0
2. [Ni(CN)4]2- with electronic configuration [Ar]3d8, dsp2 hybridization
3. Ni2+ with electronic configuration [Ar]3d6, 4s2
4. [Ni(CN)4]2- with electronic configuration [Ar]3d6, sp3 hybridization

Correct answer: [Ni(CN)4]2- with electronic configuration [Ar]3d8, dsp2 hybridization

Solution

CN- is a strong field ligand that causes pairing of electrons in the 3d orbitals of Ni2+. This leads to dsp2 hybridization, forming a square planar geometry for [Ni(CN)4]2-.

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