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CMC Medical CMC-Medical Ludhiana Solved Paper-2015

  • question_answer
    Using the EAN rule, predict the value of\[x\]in\[Ni\,{{(CO)}_{x}},{{K}_{4}}[Fe{{(CN)}_{x}}].\]

    A)  6, 4                       

    B)  4, 6   

    C)  5, 8                       

    D)  8, 5

    Correct Answer: B

    Solution :

                    EAN = Z (atomic number of the metal) - number of electrons lost in the ion formation + number of electrons gained from the donor atoms of the ligands. \[EAN=28-0+2x=36\]                                 \[2x=36-28\]                                 \[2x=8\]                                 \[x=4\] The formula of the compound is\[Ni\,{{(CO)}_{4}}\]. \[{{K}_{4}}[Fe{{(CN)}_{x}}]\] \[EAN=(26-2)+(2x)=36\,(Kr)\]        \[x=6\] \[\therefore \]The formula of the compound is \[{{K}_{4}}[Fe{{(CN)}_{6}}].\]


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