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 d- block metal ions is generally due to d-d transition
C. All the complexes of Cu^(+)` are colourless on account of diamagnetic nature `(d^(10)` configuration ).
D. `CrO_(3)` is bright orange due to CTLM.

Answer

C

Explanation

Conceptual