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The Oxidation number of Ni in [Ni (CO)4] is - 

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The Oxidation number of Ni in [Ni (CO)4] is - 

A. 0 

B. 2 

C. 3 

D. 4

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1 Answer

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Correct Answer is: A. 0 

In nickel tetra carbonyl, the oxidation state for nickel is assigned as zero. The formula conforms to 18-electron rule. The molecule is tetrahedral, with four carbonyl (carbon monoxide) ligands attached to nickel.

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