A) \[C{{u}^{+}},\,C{{u}^{2+}},\,N{{i}^{2+}}\]
B) \[C{{u}^{2+}},C{{O}^{2+}},S{{c}^{3+}}\]
C) \[C{{u}^{2+}},F{{e}^{2+}},C{{O}^{2+}}\]
D) \[N{{a}^{+}},M{{g}^{2+}},A{{l}^{3+}}\]
Correct Answer: C
Solution :
Species having unpaired electrons in d-orbitals, allow d-d transition, hence are colored.
Hence, \[C{{u}^{2+}},F{{e}^{2+}}\]and \[C{{o}^{2+}}\]constituate a set of coloured ions.
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