1.

[T_i (H_2O)_6]^(3+ )is coloured ,while [Sc(H_2O)_6]^(3+) is colourless -explain

Answer»

Solution :`Ti" in "[Ti(H_(2)O)^(6)]^(3+)" is in +3 oxidation state"`
`Sc" in "[Sc(H_(2)O)_(6)]^(3+)" is in +3 oxidation state."`
The outer electronic configuration of Sc, Ti and their trivalent ions are.
`{:(SC,:,3D^(1)4S^(2)""Ti,:,3d^(2)4S^(2)),(SC^(3+),:,3d^(0)""Ti^(3+),:,3d^(1)):}`
`Ti^(3+)` has one unpaired electron in 3d orbital and they undergoes d - d transition. This electron can be promoted to a higher ENERGY level by LIGHT absorption. Therefore `[Ti(H_(2)O)^(6)]^(3+)` is COLOURED.
In the case of `[Sc(H_(2)O)_(6)]^(3+)`, there is no electron in 3d orbital of `Sc^(3+)`, hence there is no possibility of light absorbance. Therefore `[Sc(H_(2)O)_(6)]^(3+)` is colourless.


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