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(B) stability constant $(K)$ is an equilibrium constant for the formation of a complex in solution.It is a measure of the strength of the interaction

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$Cu^{2+} + 4CN^{-} ightleftharpoons [Cu(CN)_4]^{2-}, K = 2.0 	imes 10^{27}$

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(B) stability constant $(K)$ is an equilibrium constant for the formation of a complex in solution.It is a measure of the strength of the interaction between the metal ion and the ligand.$A$ higher value of the stability constant indicates a more stable complex,which implies that the ligand is stronger.Comparing the given values:$K(H_2O) = 9.5 	imes 10^8$$K(NH_3) = 4.5 	imes 10^{11}$$K(en) = 3.0 	imes 10^{15}$$K(CN^-) = 2.0 	imes 10^{27}$Since the reaction $Cu^{2+} + 4CN^{-} ightleftharpoons [Cu(CN)_4]^{2-}$ has the maximum stability constant value $(2.0 	imes 10^{27})$,$CN^{-}$ is the strongest ligand.

From the stability constant (hypothetical values) given below,predict which is the strongest ligand:

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