Answer:
The \[Z{{n}^{2+}}\] ion has all
filled orbitals whereas \[C{{u}^{2+}}\] ion (\[3{{d}^{9}}\] configuration) has
one half filled 3d-orbital. It has therefore, a tendency to form coloured ion
in solution whereas \[Z{{n}^{2+}}\] has no such tendency. Thus, \[Z{{n}^{2+}}\]
salts are white while those of \[C{{u}^{2+}}\] are blue.
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