Q31 / 160 · TS EAMCET 2022 (20 Jul Shift 2) · Chemistry

Choose the correct statement. $\mathrm{Fe}^{3+}$ ion is more stable than $\mathrm{Fe}^{2+}$ ion because

  • A
    More the charge on the atom, more is its stability
  • Correct answer
    B
    Configuration of $\mathrm{Fe}^{2+}$ is $3 \mathrm{~d}^6$ while $\mathrm{Fe}^{3+}$ is $3 \mathrm{~d}^5$
  • C
    $\mathrm{Fe}^{2+}$ has a larger size than that of $\mathrm{Fe}^{3+}$
  • D
    $\mathrm{Fe}^{3+}$ ions are coloured

Solution

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 $\mathrm{Fe}^{2+}\left(\mathrm{d}^6\right)$.

Hence, the correct answer is option: 'B'.

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