Transition metals usually from coloured complexes and d-d transitions `(t_(2g)hArre_(g))` are responsible for colour as the energy difference between `t_(2g)` and `e_(g)` lies in visible region. But all the coloured ions are not dut to d-d transition but charge transfer bands also play important roles. Charge transfer bands may be of two types.
(i) ligand to metal (CTLM)`" "(ii)` metal to ligand (CTML).
Charge transfer transition always produces intense colour as compared to d-d transition.
Select the incorrect statement `:`

Options

A. d-block metal ions are usually coloured.
B. colour of the most of d-block metal ions is enerally due to d-d transiton.
C. All the complexes of `Cu^(+)` are colourless on account of diamagnetic nature i.e., `d^(10)` configuration
D. `CrO_(3)` is bright orange due to CTLM.

Answer

C