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  4. There is no d-d transition in Cu+ but Cu2O is coloured due to

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Q. There is no $d-d$ transition in $Cu^{+}$ but $Cu_{2}O$ is coloured due to

NTA AbhyasNTA Abhyas 2020Coordination Compounds

Solution:

There is no $d-d$ transition in $Cu^{+}$ because $d-$ orbital is completely filled, but $Cu_{2}O$ is coloured due to charge transfer from oxygen to metal which can undergo an electronic transition into an excited electronic state.