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The stabilization of coordination compound due to chelation is called the chelate effect. Which of the following is the most stable complex species?A. `[Fe(CO)_(5)]`B. `[Fe(CN)_(6)]^(3-)`C. `[Fe(C_(2)O_(4))_(3)]^(3-)`D. `[Fe(H_(2)O)_(6)]^(3+)`

Answer» Correct Answer - 3
Chelation (formation of cycle by linkage between metal ion and ligand) stabilizes the coordination compound. The ligand which chelates the metal ion are known as chelating ligand. Here, only `[Fe(C_(2)O_(4))_(3)]^(3-)` is a coordination compound which contains oxalate ion as a chelating ligand. Hence, it stabilizes coordination compound by chelating `Fe^(3+)` ion.


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