Whch of the following pairs involves isoelectronic ions

Whch of the following pairs involves isoelectronic ions
  1. $\mathrm{Mn}^{3+}$ and $\mathrm{R} \mathrm{e}^{2+}$
  2. $\mathrm{Mn}^{2+}$ and $\mathrm{Fe}^{3+}$
  3. $\mathrm{Cr}^{3+}$ and $\mathrm{Mn}^{2+}$
  4. $\mathrm{Fe}^{2+}$ and $\mathrm{Co}^{2+}$

Solution

Among the given choice $\mathrm{Mn}^{2+}$ and $\mathrm{Fe}^{3+}$ involve isoelectronic ions. ,

Asked in: JEE-TOPICTESTS-CHEMISTRY

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