9.31 Amongst the following, the most stable complex is: (i) $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ (ii) $\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ (iii) $\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ (iv) $\left[\mathrm{FeCl}_6\right]^{3-}$

Question

9.31 Amongst the following, the most stable complex is: (i) $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ (ii) $\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right]^{3+}$ (iii) $\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ (iv) $\left[\mathrm{FeCl}_6\right]^{3-}$,

MARKS App · Accepted Answer

In each of the given complex, $\mathrm{Fe}$ is in $+3$ oxidation state. As $\mathrm{C}_2 \mathrm{O}_4{ }^{2-}$ is didentate chelating ligand, it forms chelate rings and hence (iii) out of complexes given above is the most stable complex.

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