A) \[C{{u}^{+}}\]
B) \[F{{e}^{2+}}\]
C) \[F{{e}^{3+}}\]
D) \[C{{u}^{2+}}\]
Correct Answer: C
Solution :
The paramagnetic character exhibited by species having unpaired electrons. Paramagnetic character \[\propto \] number of unpaired electrons. \[C{{u}^{+}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}4{{s}^{0}}\] (no unpaired electron \[\therefore \] diamagnetic) \[C{{u}^{2+}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{9}}\] (one unpaired electron) \[F{{e}^{2+}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{6}}\] (4 unpaired electrons) \[F{{e}^{3+}}=1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{5}}\] unpaired electrons) As \[F{{e}^{3+}}\] has highest number of unpaired electrons therefore, it has maximum paramagnetic character. [Atomic number of Cu = 29, Fe = 26]
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