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InterviewSolution
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Which of the following is a low spin (spin-paired) complex ?A. `[Co(NH_(3))_(6)]^(3+)`B. `[Ni(NH_(3))_(6)]^(2+)`C. `[Co(NH_(3))_(6)]^(2+)`D. `[Fe(C_(2)O_(4))_(3)]^(3-)` |
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Answer» Correct Answer - A `[Co(NH_(3))_(6)]^(3+) rarr d^(2) sp^(3)` hybridization `rarr` zero unpaired electrons `[Ni(NH_(3))_(6)]^(2+) rarr sp^(3) d^(2)` hybridization `rarr` Two unpaired electrons `[Co(NH_(3))_(6)]^(2+) rarr sp^(3) d^(2)` hybridization `rarr` Three unpaired electrons A low spin (or spin-paired) complex, such as `[Co(NH_(3))_(6)]^(3+)` is one in which the electrons are paired up to give a maximum number of doubly occupied d orbitals and a minimum number of unpaired electrons. Usually inner orbital complexes `(d^(2)sp^(3))` are low-spin (or spin paired) complexes. `Fe^(3+)` has a `d^(5)` electronic configuration. Thus complexes with weak field ligands (such as halide ions) will have a high spin arrangement with five unpaired electrons. On the other hand, strong field ligands such as `CN^(-) SCN^(-)` and oxalate form complexes with `Fe^(3+)` which have a spin paired arrangement. |
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