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Question
Amongst the following, the most stable complex is:
Options
[Fe(H2O)6]3+
[Fe(NH3)6]3+
[Fe(C2O4)3]3−
[FeCl6]3−
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Solution
[Fe(C2O4)3]3−
Explanation:
[Fe(C2O4)3]3− is the most stable complex because oxalate ion \[\ce{(C2O^{2-}_4)}\] is a bidentate ligand. Bidentate ligands form chelate rings with the metal ion, which increases the stability of the complex due to the chelate effect. The other ligands (H2O, NH3, Cl−) are monodentate ligands and form comparatively less stable complexes.
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