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B
sd3 and square planar
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C
sp3 and tetrahedral
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D
dsp2 and square planar
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Solution
The correct option is Ddsp2 and square planar
[Ni(CN)4]2− is a square planar geometry formed by dsp2 hybridisation. [Ni(CN)4]2− is diamagnetic, so Ni2+ionhas3d^8$ outer configuration with two unpaired electrons.
For the formation of the square planar structure by dsp2 hybridisation, two unpaired d-electrons are paired up due to energy made available by the approach of ligands, making one of the 3d orbitals empty.