Pair of ions with the same number of unpaired electrons: Fe3+ and Mn2+

1. A.
   $\text{Co}^{2+}$ and $\text{Mn}^{3+}$
2. B.
   $\text{Mn}^{2+}$ and $\text{Zn}^{2+}$
3. C.
   $\text{Fe}^{3+}$ and $\text{Mn}^{2+}$
4. D.
   $\text{Sc}^{3+}$ and $\text{Co}^{2+}$

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1. A.
   (B) and (D) only
2. B.
   (A) and (E) only
3. C.
   (C) and (D) only
4. D.
   (A) and (D) only

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