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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    Specify the coordination number of cobalt in \[[Co(CN)({{H}_{2}}O){{(en)}^{2}}]{{~}^{2+}}\]

    A)  6       

    B)  4       

    C)  0       

    D)  3

    Correct Answer: D

    Solution :

     Let oxidation number of Co be x; Oxidation number of\[{{H}_{2}}O=0;\] Oxidation number of\[~CN=-1\] Therefore \[{{[Co(CN)({{H}_{2}}O){{(en)}^{2}}]}^{2}}\] \[\therefore \] \[x+2(0)-1=+\,2\] \[x-1=+\,2=+\,3\]or 3 Hence, coordination number of Co is 3.


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