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Question

The oxidation number of cobalt in K[Co(CO4)]?

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Solution


The complex can be written as K+[Co(CO)4]

Since CO is a neutral ligand there its charge is zero.
Let oxidation number of cobalt be 'x'
So the equation is:
oxidation number of Co + 4 × charge on CO ligand = charge of complex
x + 4(0) = -1
x = -1
Therefore, the oxidation number of Co in the given complex is −1.

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