Question
$E^\circ$ values of $Mn, Ni$ and $Zn$ are more negative than expected.
✓
Answer
Negative $E^\circ$ values for $Mn^{2+}$ and $Zn^{2+}$ are related to stabilities of half$-$filled and fully filled configurations, respectively. But for $Ni^{2+}, E^\circ$ value is related to the highest negative enthalpy of hydration.
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