A) \[{{V}^{3+}}\]
B) \[C{{r}^{3+}}\]
C) \[T{{i}^{3+}}\]
D) \[S{{c}^{3+}}\]
Correct Answer: D
Solution :
The electronic configuration of Sc is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}3{{d}^{1}},4{{s}^{2}}\] and configuration of \[S{{c}^{3+}}\] is \[1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}3{{p}^{6}}\] So, \[S{{c}^{3+}}\] is colourless due to the absence of unpaired electrons in d-orbital.
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