The incorrect relationship in the following pairs in relation to ionisation enthalpies is :

The incorrect relationship in the following pairs in relation to ionisation enthalpies is :
  1. $\mathrm{Mn}^{+} \lt \mathrm{Cr}^{+}$
  2. $\mathrm{Mn}^{+} \lt \mathrm{Mn}^{2+}$
  3. $\mathrm{Fe}^{2+} \lt \mathrm{Fe}^{3+}$
  4. $\mathrm{Mn}^{2+} \lt \mathrm{Fe}^{2+}$

Solution

$\mathrm{Mn}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^5$
Half filled stability
More 1 E than $\mathrm{Fe}^{2+}$
$\mathrm{Fe}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^6$

Asked in: JEE Main 2025 (04 Apr Shift 2)

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