The oxidation number of cobalt in K[Co(CO)_4] | vedclass

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Question

(B) The complex is $K[Co(CO)_4]$.Let the oxidation number of $Co$ be $x$.The oxidation number of $K$ is $+1$ and the ligand $CO$ (carbonyl) is neutral

Vedclass · Accepted Answer

$-1$

Vedclass · Answer

(B) The complex is $K[Co(CO)_4]$.Let the oxidation number of $Co$ be $x$.The oxidation number of $K$ is $+1$ and the ligand $CO$ (carbonyl) is neutral,so its oxidation number is $0$.Setting the sum of oxidation states to $0$ for the neutral complex:$1 	imes (+1) + x + 4 	imes (0) = 0$$1 + x = 0$$x = -1$Therefore,the oxidation number of $Co$ is $-1$.

The oxidation number of cobalt in $K[Co(CO)_4]$ is

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