A) \[N{{i}^{2+}}\]
B) \[C{{u}^{+}}\]
C) \[T{{i}^{2+}}\]
D) \[F{{e}^{3+}}\]
Correct Answer: B
Solution :
Transitional metal ion having electronic configuration \[(n-1)\,{{d}^{o}}\] or \[(n-1)\,{{d}^{10}}\]are colourless. \[N{{i}^{2+}}:[Ar]\,3{{d}^{8}};\]coloured \[C{{u}^{+}}:[Ar]\,3{{d}^{10}};\]coloured \[T{{i}^{2+}}:[Ar]\,3{{d}^{2}};\]coloured \[F{{e}^{3+}}:[Ar]\,3{{d}^{5}};\]coloured
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