Pair of ions with the same unpaired electrons or spin-only moment: Cr2+ and Fe2+

1. A.
   $\mathrm{Ti^{3+}}$ and $\mathrm{Zn^{2+}}$
2. B.
   $\mathrm{Cr^{2+}}$ and $\mathrm{Fe^{2+}}$
3. C.
   $\mathrm{Cr^{3+}}$ and $\mathrm{Ti^{3+}}$
4. D.
   $\mathrm{Zn^{2+}}$ and $\mathrm{Cu^{2+}}$

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1. A.
   $\mathrm{Fe^{2+}}$ and $\mathrm{Mn^{2+}}$
2. B.
   $\mathrm{Co^{2+}}$ and $\mathrm{Ni^{2+}}$
3. C.
   $\mathrm{Fe^{2+}}$ and $\mathrm{Cr^{2+}}$
4. D.
   $\mathrm{Co^{2+}}$ and $\mathrm{Fe^{2+}}$

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