Aqueous $C u^{+ 2}$ ions are blue in color, where as aqueous $Z n^{+ 2}$ ions are colorless. Why?

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Solution

The valence shell electronic configuration of $C u^{+ 2}$ ion is $3 d^{9}$ . It contains 1 unpaired electron.
The valence shell electronic configuration of $Z n^{+ 2}$ ion is $3 d^{10}$ . It contains 0 unpaired electrons.
Hence, aqueous $C u^{+ 2}$ ions are blue in color, where as aqueous $Z n^{+ 2}$ ions are colorless.
Note: Transition metal ions are coloured due to presence of unpaired electrons.

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