A) \[\text{N}{{\text{i}}^{\text{3+}}}\]
B) \[\text{M}{{\text{n}}^{\text{3+}}}\]
C) \[\text{F}{{\text{e}}^{\text{3+}}}\]
D) \[\text{C}{{\text{o}}^{\text{3+}}}\]
Correct Answer: D
Solution :
Key Idea Write the electronic configurations of given ions and find the correct answer. \[N{{i}^{3+}}(28)=[Ar]3{{d}^{7}}\] \[M{{n}^{3+}}(25)=[Ar]3{{d}^{4}}\] \[F{{e}^{3+}}(26)=[Ar]\,3{{d}^{5}}\] \[C{{o}^{3+}}(27)=[Ar]\,3{{d}^{6}}\]
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