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The stability of ferric ion is due to

1. half filled f-orbitals
2. half filled d-orbitals
3. completely filled f-orbitals
4. completely filled d-orbitals

Correct answer: half filled d-orbitals

Solution

Ferric ion is Fe3+, which has the configuration [Ar] 3d5. A half-filled d-subshell is especially stable because it has maximum exchange energy and symmetrical distribution of electrons.

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