A) 3
B) 5
C) 4
D) 1
Correct Answer: A
Solution :
In \[C{{r}^{3+}}\] number of unpaired \[{{e}^{-}}=3\]. A electronic configuration of \[C{{r}^{3+}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{3}}\].
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