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Question: Which of the following complexes has the highest stability constant at 298 K....

Which of the following complexes has the highest stability constant at 298 K.

A

[CdCl4]2−\left\lbrack CdCl_{4} \right\rbrack^{2 -}

B

[CdBr4]2−\left\lbrack CdBr_{4} \right\rbrack^{2 -}

C

[CdI4]2−\left\lbrack CdI_{4} \right\rbrack^{2 -}

D

[Cd(CN)4]2−\left\lbrack Cd(CN)_{4} \right\rbrack^{2 -}

Answer

[Cd(CN)4]2−\left\lbrack Cd(CN)_{4} \right\rbrack^{2 -}

Explanation

Solution

The cyano and ammine complexes are far more stable than those formed by halide ions. This is due to the fact that NH3NH_{3} and CN−CN^{-}are strong lewis bases.