Coordination CompoundHard

Question

Of  the following complex ions, the one that probably has the largest overall formation constant, Kf, is :

Options

A.[Co(NH3)6]3+
B.[Co(H2O)6]3+
C.[Co(NH3)2(H2O)4]3+
D.[Co(en)3]3+

Solution

(D) Chelate complex has higher stability than the similar complexes having monodentate ligands and an higher stability means higher overall formation constant.

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