CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2003

  • question_answer
    Pick out the complex compound in which the central metal atom obeys EAN rule strictly :

    A)  \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]    

    B)  \[{{K}_{3}}[Fe{{(CN)}_{6}}]\]

    C)  \[[Cr{{({{H}_{2}}O)}_{6}}]C{{l}_{3}}\]     

    D)  \[[Cu{{(N{{H}_{3}})}_{4}}]S{{O}_{4}}\]

    Correct Answer: A

    Solution :

    For \[{{K}_{4}}[Fe{{(CN)}_{6}}]\], the EAN of \[F{{e}^{2+}}\] ion\[=(26-2+12)=36\]. Hence it follows BAN rule, as its BAN is equal to number of electrons of Kr (inert gas), i.e., 36.


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