Engineering
Chemistry
Important Term for Coordination Compounds
Crystal Field Theory and Valence Bond Theory
Stability of Complex
Question
The most stable complex species is:
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Solution
The stability of the complex depends on the charge density of the central metal ion.
The charge density of Fe3+ ion is higher than that of Fe2+ ion.
Thus the [Fe(CN)6]4– complex containing Fe2+ ion is least stable.
The stability of the complex also depends on the basic strength of the ligand.
Greater is the base strength of the ligand, greater is the stability of the complex. Also if the ligand forms the ring structure it's more stable.
Hence, the most stable ion is [Fe(C2O4)3]3–