JEE Main & Advanced Chemistry Coordination Chemistry Question Bank Complexes and complex stability

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

    A) \[{{\left[ CdC{{l}_{4}} \right]}^{2-}}\]

    B) \[{{\left[ CdB{{r}_{4}} \right]}^{2-}}\]

    C) \[{{\left[ Cd{{I}_{4}} \right]}^{2-}}\]

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

    Correct Answer: D

    Solution :

      The cyano and ammine complexes are far more stable than those formed by halide ions. This is due to the fact that \[N{{H}_{3}}\] and \[C{{N}^{-}}\]are strong lewis bases.


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