Which pair of metal ions from following have same number of unpaired electrons?

1. $\mathrm{Co}^{2+}$ and $\mathrm{Mn}^{3+}$
2. $\mathrm{Mn}^{2+}$ and $\mathrm{Zn}^{2+}$
3. $\mathrm{Fe}^{3+}$ and $\mathrm{Mn}^{2+}$
4. $\mathrm{Sc}^{3+}$ and $\mathrm{Co}^{2+}$

Asked in: MHT CET 2024 (16 May Shift 2)

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