Which of the following ions is coloured in aqueous solution?
i) $C u^{2 +}$
ii) $C u^{1 +}$

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Solution

$C u^{2 +}$ is coloured because d-d transition. It is only possible when d-subshell have unpaired electron. $C u^{2 +}$ has partially filled orbital. Hence $C u^{2 +}$ is coloured.
It is not colored. To be colored, you need some kind of electron transition within the atom/ion. A basic necessity would be either unpaired electrons or a possibility of resonance.The d orbitals are fully filled, which means no unpaired electrons. The absence of electron transitions cause $C u^{+}$ to be a colorless ion.

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