Question
[Ti(H2O)]3+ is coloured while [Sc(H2O)6]3+ is colourless.
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Answer
This is due to d-d transition of electron in [Ti(H2O)]3+ complex Ti3+ has one electron in d-orbital (3d1) which absorb energy corresponding to blue-green region and jumps from t2g to eg set of d-orbitals $\big(\text{t}^1_{2\text{g}}\text{ e}^0_{\text{g}}\xrightarrow{\ \ \ \ \ }\text{t}^0_{2\text{g}}\text{ e}^1_{\text{g}}\big).$ But Sc3+ has no electron in the d-orbital.
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