`Ti^(2+)` is purple while `Ti^(4+)` is colourless because

Options

A. there is no crystal field effect in `Ti^(+4)`
B. `Ti^(2+)` has `3d^2` configuration
C. `Ti^(4+)` has `3d^2` configuration
D. `Ti^(4+)` is a very small cation when compard to `Ti^(2+)` and hence. Does not absorb any radiation.

Answer

B

Explanation

`Ti(22) rarr 3d^2 4s^2`
`Ti^(2+) rarr 3d^(2)4s^(0)` (d-d transition is possible , so it coloured)
`Ti^(4+) rarr 3d^0 4s^0` (no- d-d transition colourless)