A) \[{{V}^{3+}}\]
B) \[C{{u}^{+}}\]
C) \[N{{i}^{2+}}\]
D) \[C{{o}^{2+}}\]
Correct Answer: B
Solution :
\[{{V}^{3+}}=23-3=20=[Ar]3{{d}^{2}}\] (2 unpaired electrons = green) \[C{{u}^{+}}=29-1=28=[Ar]\,3{{d}^{10}}\] (Number of unpaired electrons = colourless) \[N{{i}^{2+}}=28-2=26=[Ar]3{{d}^{8}}\] (2 unpaired electrons = green) \[C{{o}^{2+}}=27-2=25[Ar]3{{d}^{7}}\] 3 (unpaired electrons = pink) Hence, the correct option is (b).
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