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Which of the following complexes is the most stable?

1. K3[Al(C2O4)3]
2. [Pt(en)]Cl
3. [Ag(NH3)2]Cl
4. K2[Ni(EDTA)]

Correct answer: K2[Ni(EDTA)]

Solution

K2[Ni(EDTA)] is the most stable complex due to the chelating effect of the EDTA ligand, which forms multiple bonds with the nickel ion, enhancing stability through a more favorable enthalpic and entropic interaction compared to the other complexes.

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