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Choose the correct statement. $\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion because
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Configuration of $\mathrm{Fe}^{2+}$ is $3 \mathrm{~d}^6$ while $\mathrm{Fe}^{3+}$ is $3 \mathrm{~d}^5$
In $\mathrm{Fe}^{3+}$, the d-orbital is half-filled $\left(\mathrm{d}^5\right)$. So, it has the maximum exchange energy which, in turn, leads to extra stability over $\mathrm{Fe}^{2+}\left(\mathrm{d}^6\right)$.
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