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| 1. |
Predict which of the following will be coloured in aqueous solution? Ti^(3+) , V^(3+) , Sc^(3+) , Mn^(2+) , Fe^(3+) , Co^(2+)and MnO_(4)^(-) |
| Answer» Solution :Only those ions will be coloured which have INCOMPLETELY filled d-orbitals. Those withfully - filled or empty d-orbitals are colourless. Thus, `Ti^(3+) , V^(3+), Mn^(2+), FE^(3+)` and `Co^(2+)`are all coloured due to d-d transition. `MnO_(4)^(-)` is also colouredbut due to CHARGE transfer ( see pages) . Only `SC^(3+) ( 3d^(0))` is colourless. | |