Transition metal compound are coloured due to `d-d` and charge transfer tranditoins, Colour due to `d-d` transition is shown by transition metal compounds having `d^(1) and d^(9)` electrons whereas the compounds containing `d^(0) and d^(10)` configurations are intensely coloured due to charge transfer transitions.
The purple colour of `[Ti(H_(2)O_(6))]^(3+)` ion is due to

Options

A. Unpaired d-electron
B. Transfer of an electron
C. Intermolecular vibrations
D. Presence of water molecules

Answer

A

Explanation

Ti in `[Ti(H_(2)O)_(6)]^(3+)` ion is in `+3` oxidation state containing one unpaired electron in 3d orbital which can undergo `d-d` transition by absorbing energy corresponding to green and yellow components from visible light and the complementary purple colour is reflected.