Question
The color of $Cu^+$ compounds is?
✓
Answer
$Cu^+$ compounds are generally colourless $($white$).$ The electronic configuration is $3d^{10}4s^0.$ So there is no unpaired electron present in the ion. So the electronic transition between two energy levels $t_{2g}$ and $e_g ($responsible for the colour of transition metals$)$ is not possible.
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