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JEE Main & Advanced AIEEE Paper (Held On 11 May 2011)

  • question_answer
    Among the ligands \[N{{H}_{3}},en,C{{N}^{-}}\]and CO the correct order of their increasing field strength, is:     AIEEE  Solved  Paper (Held On 11 May  2011)

    A) \[N{{H}_{3}}<en<C{{N}^{-}}<CO\]

    B) \[C{{N}^{-}}<N{{H}_{3}}<CO<en\]

    C) \[en<C{{N}^{-}}<N{{H}_{3}}<CO\]

    D) \[CO<N{{H}_{3}}<en<C{{N}^{-}}\]

    Correct Answer: A

    Solution :

                                    Ligands can be arranged in a series in the orders of increasing field strength as given below: \[{{l}^{-}}<B{{r}^{-}}<{{S}^{2-}}<C{{l}^{-}}<NO_{3}^{-}<{{F}^{-}}<O{{H}^{-}}<EtOH<{{C}_{2}}O_{4}^{2-}\]\[<{{H}_{2}}O<NC{{S}^{-}}<EDTA<N{{H}_{3}}<N{{H}_{3}}<en<NO_{2}^{-}<C{{N}^{-}}<CO\] Such a series is termed as spectro chemical series. It is an experimentally determined series based on the absorption of light by complexes with different ligands.


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