Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
The oxidation number of cobalt in $\ce{K[Co(CO)_4]}$ is:
A
$+1$
B
$+3$
✓
$–1$
D
$–3$
✓
Answer
Correct option: C.
$–1$
We know that $CO$ is a neutral ligand and $K$ carries a charge of $+1$.
Therefore, the complex can be written as $\ce{K^+[Co(CO)_4]^-}$ .
Therefore, the oxidation number $−$ of $Co$ in the given complex is $-1.$
Hence, option $(iii)$ is correct.
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