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The oxidation number of cobalt in K[CO(CO)4] is

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The oxidation number of cobalt in K[CO(CO)4] is

(i) +1 

(ii) +3 

(iii) -1 

(iv) -3

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We know that CG is a neutral ligand and K carries a charge of + 1. Therefore, the complex is written as K+ [Co (CO)4]–. Therefore, the oxidation number of Co in the given complex is -1.

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