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In which of the following coordination compounds, the central metal ion is in zero oxidation state?
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The correct answer is:
$\mathrm{Fe}(\mathrm{CO})_5$
Let oxidation state of $\mathrm{Fe}=x$
For $\mathrm{Fe}(\mathrm{CO})_5, x+(5 \times 0)=0$
$\Rightarrow \quad x=0$
For $\mathrm{Fe}(\mathrm{CO})_5, x+(5 \times 0)=0$
$\Rightarrow \quad x=0$
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