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

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Q. The oxidation number of cobalt in $K \left[ Co ( CO )_{4}\right]$ is:

Redox Reactions

Solution:

Let the oxidation number of Co be $x$.

In $K \left[ Co ( CO )_{4}\right], 1+ x +0=0$ [as CO is neutral]

$x=-1$