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