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J & K CET Medical J & K - CET Medical 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 \[{{[Co(CN)({{H}_{2}}O){{(en)}^{2}}]}^{2}}\] \[x+2(0)-1=+2\] \[x-1=+2=+3\text{ }or\text{ }3\] Hence, coordination number of\[Co\]is 3.


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