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Question
Mention the number of unpaired electrons and geometry of the following complex:
\[\ce{[Ni(CN)4]^2-}\]
Solution
The oxidation state of Nickel is +2.
Valence shell electronic configuration of \[\ce{Ni^{2+}}\]
The complex is square planar geometry, so \[\ce{Ni^{2+}}\] ion uses dsp2 hybrid orbitals.
3d electrons are paired prior to hybridization, and the electronic configuration of \[\ce{Ni^{2+}}\] becomes:
The complex has no unpaired electrons, and hence it is diamagnetic.
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