Q.The geometry of $[Ni(CO)_4]$ and $[Ni(CN)_4]^{2-}$ are respectively:

Tetrahedral and Square planar

Both Square planar

Both Tetrahedral

Square planar and Tetrahedral

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Q.The geometry of [Ni(CO)4][Ni(CO)_4][Ni(CO)4​] and [Ni(CN)4]2−[Ni(CN)_4]^{2-}[Ni(CN)4​]2− are respectively: