A) Copper crystals
B) \[C{{u}^{+}}\]
C) \[C{{u}^{++}}\]
D) \[{{H}_{2}}\]
Correct Answer: C
Solution :
\[C{{u}^{2+}}=[A{{r}_{18}}]\,3{{d}^{9}}4{{s}^{0}}\] it has one unpaired electron so it is paramagnetic.
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