A) half-filled d-orbitals
B) half-filled f-orbitals
C) completely filled d-orbitals
D) completely filled f-orbitals
Correct Answer: A
Solution :
E.C. of \[F{{e}^{3+}}\]ion i.e., \[F{{e}^{3+}}\text{=1}{{\text{s}}^{\text{2}}},\text{2}{{\text{s}}^{\text{2}}},\text{2}{{\text{p}}^{\text{6}}},\text{3}{{\text{s}}^{\text{2}}},\text{3}{{\text{p}}^{\text{6}}},\text{3}{{\text{d}}^{\text{5}}}\]. Therefore, ferric ion is quite stable due to half-filled d-orbitals.
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