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Why $\mathrm{E}^{\circ}$ values for $\mathrm{Mn}, \mathrm{Ni}$ and $\mathrm{Zn}$ are more negative than expected?
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Mn and $\mathrm{Zn}$ have high negative value of $E^{\circ}$ due to stabilities of their half filled and fully filled configuration respectively. While for $\mathrm{Ni}$ high negative $\mathrm{E}^{\circ}$ value is due to highest negative enthalpy of hydration.
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