JEE Main Chemistry question
How many of the following use outer -orbital in complex formation? [Ni(H_2O)_4]^{2+}, Ni(CO)_4, [Ni(CN)_4]^{2-}, [Fe(CN)_6]^{4-}
Answer: 2
Solution
and are both -hybridised (tetrahedral), using no -orbital at all. (square planar,
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