InterviewSolution
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InterviewSolution
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Which of the following ions is colourless in solution?A. `V^(3+)`B. `Cr^(3+)`C. `Co^(2+)`D. `Sc^(3+)` |
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Answer» Correct Answer - D `V(23=[Ar]3d^(3),4s^(2)` `V^(3+)=[Ar]3d^(2),4s^(0)` (Two unpaired electrons) `Cr(24)=[Ar]3d^(5),4s^(1)` `Cr^(3+)=[Ar]3d^(3+),4s^(0)` (Three unpaired electrons) `Co(27)=[Ar]3d^(7),4s^(2)` `Co^(2+)=[Ar]3d^(7),4s^(0)` (Three unpaired electrons) `Sc(21)=[Ar]3d^(1),4s^(2)` `Sc^(3+)=[Ar]3d^(0),4s^(0)` (No unpaired electrons) Thus, in `Sc^(3+)` no unpaired d-electrons is present. Hence, no d-d transition is possible and it is colourless ion . |
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