JEE MAIN - Chemistry (2025 - 4th April Evening Shift - No. 10)
The incorrect relationship in the following pairs in relation to ionisation enthalpies is :
$\mathrm{Mn}^{2+}<\mathrm{Fe}^{2+}$
$\mathrm{Mn}^{+}<\mathrm{Mn}^{2+}$
$\mathrm{Mn}^{+}<\mathrm{Cr}^{+}$
$\mathrm{Fe}^{2+}<\mathrm{Fe}^{3+}$
Explanation
$$\mathrm{Mn}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^5$$
Half filled stability
More 1E than $\mathrm{Fe}^{2+}$
$$\mathrm{Fe}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^6$$
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