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

  • question_answer
    In any ferric salt, on adding potassium ferrocyanide, a prussian blue colour is obtained, which is [BIT 1992; BHU 2002]

    A) \[{{K}_{3}}Fe{{(CN)}_{6}}\]

    B) \[KFe\left[ Fe{{\left( CN \right)}_{6}} \right]\]

    C) \[FeS{{O}_{4}}.Fe{{(CN)}_{6}}\]

    D) \[F{{e}_{4}}{{\left[ Fe{{(CN)}_{6}} \right]}_{3}}\]

    Correct Answer: D

    Solution :

      \[\underset{\text{pot}\text{. ferrocyanide}}{\mathop{3\,{{K}_{4}}[Fe{{(CN)}_{6}}]+4FeC{{l}_{3}}}}\,\to \underset{\text{(Prussion blue)}\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{\text{(Ferri ferrocynide)}\,\,\,\,\,\,\,\,\,\,}{\mathop{F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}+\,12KCl}}\,}}\,\]


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