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  4. The stability of ferric ion is due to

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Q. The stability of ferric ion is due to

AMUAMU 2004

Solution:

Half-filled or completely filled orbitals are quite stable than incompletely filled orbitals.
The atomic number of iron is 26 and its electronic configuration is $3 d^{6} 4 s^{2}$.
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In ferric ion $d$-orbital is half filled therefore, the stability of ferric ion is due to half filled $d$-orbitals.