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 correct statement
A. In CTML, no net reduction - oxidation takes place because of the short life time of excited state.
B. `Cu_(2)O` is a red coloured salt.
C. Vermilon `(HgS)` is a red coloured compound.
D. All of these