A) \[C{{u}^{+}}\]
B) \[C{{u}^{2+}}\]
C) \[F{{e}^{2+}}\]
D) \[M{{n}^{2+}}\]
Correct Answer: A
Solution :
Transitional metal ions having electronic configuration \[(n-1)\,{{d}^{o}}\]or\[(n-1)\,\,{{d}^{10}}\]are colourless while those have \[(n-1)\,{{d}^{1-9}}\] are coloured. \[C{{u}^{+}}:[Ar]\,3{{d}^{10}}:\,colurless\] \[C{{u}^{2+}}:[Ar]\,3{{d}^{9}}:\,\text{coloured}\] \[F{{e}^{2+}}:[Ar]\,3{{d}^{6}}:\,coloured\] \[M{{n}^{2+}}:[Ar]\,3{{d}^{5}}:\text{coloured}\]
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