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KVPY Sample Paper KVPY Stream-SX Model Paper-16

  • question_answer
    Homoleptic octahedral complexes of a metal ion 'M with three monodentate ligands \[{{L}_{1}},\]\[{{L}_{2}}\] and \[{{L}_{3}},\] absorb  wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is

    A) \[{{L}_{3}}<{{L}_{1}}<{{L}_{2}}\]

    B) \[{{L}_{3}}<{{L}_{2}}<{{L}_{1}}\]

    C) \[{{L}_{1}}<{{L}_{2}}<{{L}_{3}}\]  

    D) \[{{L}_{2}}<{{L}_{1}}<{{L}_{3}}\]

    Correct Answer: A

    Solution :

    \[{{L}_{1}}\] \[{{L}_{2}}\] \[{{L}_{3}}\]
    Green Blue Red absorbed wavelength
     Order of \[\lambda \] Red > Green > Blue
    \[~{{L}_{3}}>{{L}_{1}}~>{{L}_{2}}\]
    \[\therefore \]Strength of ligand \[\alpha \Delta \,\,\,\alpha \,\,\,1/\lambda \]
    \[\therefore \] Strength of ligand \[{{L}_{2}}\] > \[{{L}_{1}}\] > \[{{L}_{3}}.\]


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