Question

There is no $d-d$ transition in $C{u}^{+}$ but $C{u}_{2}O$ is coloured due to

• A. The presence of unpaired electron
• B. The presence of coloured $O^{2-}$ ion
• C. Charge transfer from oxygen to metal
• D. Charge transfer from metal to oxygen

Answer 1

Answer: (C)

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