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.
`MnO_(4)^(-)` is dark purple coloured though Mn is in `(+VII)` oxidation state with `3d^(@)` configuration
A. due to d-d transition
B. due to CTML spectra
C. due to CTLM spectra
D. None of these
