Transition metals usually form coloured complexes and d–d transitions (t 2g 
e 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 due 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.
(i) Select the incorrect statement :
Text Solution
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(i) Cu + also form some coloured complexes/compounds due to charge transfer e.g., Cu 2 O is red and Cu 2 S is black.
(ii) It is fact, charge transfer transition always produces intense colour as compared to d-d transition.
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