Which one of the following complexes in an outer orbital complex?

1. $\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{4-}$
2. $\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+}$
3. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}$
4. $\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{4-}$

Solution

Asked in: JEE Main 2004

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