A) \[C{{u}^{2+}}\]
B) \[{{V}^{3+}}\]
C) \[C{{o}^{2+}}\]
D) \[N{{i}^{2+}}\]
Correct Answer: A
Solution :
Transition metal ions containing\[(n-1){{d}^{o}}\]or \[(n-1){{d}^{10}}\]electronic configuration are colorless. The colour of the transition metal is due to d-d transitions or due to presence of unpaired electrons.\[C{{u}^{2+}}(Z=29)\]has no unpaired electron and has\[(n-1){{d}^{10}}\]configuration. Hence, d-d transitions is not possible and therefore, it is colorless \[C{{u}^{2+}}(Z=29):[Ar]\,3{{d}^{10}}4{{s}^{0}};\]no unpaired electron \[C{{o}^{2+}}(Z=27):[Ar]\,3{{d}^{7}}4{{s}^{0}};3\]unpaired electron \[{{V}^{3+}}(Z=23):[Ar]\,3{{d}^{2}}4{{s}^{0}};2\]unpaired electrons \[N{{i}^{2+}}(Z=28):[Ar]\,3{{d}^{8}}4{{s}^{0}};2\]unpaired electrons
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