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 colorless while those have\[(n-1){{d}^{1-9}}\]are coloured. \[C{{u}^{+}}:[\text{ }Ar]\text{ }3{{d}^{10}}:\]colorless \[C{{u}^{2+}}:[Ar]\text{ }3{{d}^{9}}:\]coloured \[F{{e}^{2+}}:[Ar]\text{ }3{{d}^{6}}:\]coloured \[M{{n}^{2+}}:[Ar]\text{ }3{{d}^{5}}:\]coloured
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