A) \[C{{u}^{+}}\]
B) \[F{{e}^{2+}}\]
C) \[Z{{n}^{2+}}\]
D) \[A{{g}^{+}}\]
Correct Answer: B
Solution :
Presence of unpaired d-electrons is an essential condition to give colour. [a] \[C{{u}^{+}}=[Ar]\,3{{d}^{10}}\] (No unpaired electron) [b] \[F{{e}^{2+}}=[Ar]\,3{{d}^{6}}4{{s}^{0}}\] (Four unpaired electrons) [c] \[Z{{n}^{2+}}=[Ar]\,3{{d}^{10}}4{{s}^{0}}\] (No unpaired electron) [d] \[A{{g}^{+}}=[Xe]\,4{{d}^{10}}\] (No unpaired electron) Hence, only \[F{{e}^{2+}}\] will give a coloured solution.You need to login to perform this action.
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