VIT Engineering VIT Engineering Solved Paper-2011

  • question_answer
    In which of the following octahedral complexes of \[Co\] (At. no. 27), will the magnitude of \[{{\Delta }_{o}}\] be the highest?

    A)  \[{{[Co{{(CN)}_{6}}]}^{3-}}\]

    B)   \[{{[Co{{({{C}_{2}}{{O}_{4}})}_{3}}]}^{3-}}\]

    C)  \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{3+}}\]   

    D)  \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}}\]

    Correct Answer: A

    Solution :

     Crystal field stabilisation energy (CFSE) for octahedral complex, \[{{\Delta }_{o}}\] depends on the strength of negative ligand. [Higher the strength   more   will   be   the   CFSE] Spectrochemically it has been found that the strength of splitting is as: \[CO>C{{N}^{-}}>NO_{2}^{-}>en>N{{H}_{3}}>py>NC{{S}^{-}}\] \[>{{H}_{2}}O>{{O}^{2-}}>o{{x}^{2-}}>O{{H}^{-}}>{{F}^{-}}>C{{l}^{-}}\] \[>SC{{N}^{-}}>{{S}^{2-}}>B{{r}^{-}}>{{I}^{-}}\]


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