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EAMCET Medical EAMCET Medical Solved Paper-1998

  • question_answer
    The oxidation number of cobalt in \[{{K}_{3}}[Co{{(N{{O}_{2}})}_{6}}]\]is:

    A)  +6                                         

    B)  3

    C)  +3                                         

    D)  -6

    Correct Answer: C

    Solution :

                     \[{{K}_{3}}[Co{{(N{{O}_{2}})}_{6}}]\xrightarrow{{}}\] or   \[3{{K}^{+}}+{{[Co{{(N{{O}_{2}})}_{6}}]}^{3-}}\] Now, \[{{[Co{{(N{{O}_{2}})}_{6}}]}^{3-}}\] \[\because \]In \[\text{NO}_{2}^{-},\]oxidation state of \[\text{NO}_{2}^{-}=-1\] \[x+(-1\times 6)=-3\] \[x-6=-3\] \[x=+6-3=+3\]


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