In which of the following coordination compounds, the central metal ion is in zero oxidation state?

In which of the following coordination compounds, the central metal ion is in zero oxidation state?
  1. $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3$
  2. $\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
  3. $\mathrm{Fe}(\mathrm{CO})_5$
  4. $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_2$

Solution

Let oxidation state of $\mathrm{Fe}=x$ For $\mathrm{Fe}(\mathrm{CO})_5, x+(5 \times 0)=0$ $\Rightarrow \quad x=0$

Asked in: AP EAMCET 2015

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