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Account for the fact that [Ni(CO)(4)] ha...

Account for the fact that `[Ni(CO)_(4)]` has tetrahedral geometry whereas `[Ni(CN)_(4)]^(2-)` has square planar geometry.

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In `[Ni(CO)_(4)]`, Ni is `sp^(3)` hybridised but in `[Ni(CN)_(4)]^(2-)` it is `dsp^(2)` hybridised.
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