1. Why Electrode potential value of Zn is not very low ?
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Metals will easily lose electrons and oxidised.
Negative electrode potential value means oxidised species is more stable than reduced species.
Mn and Zn have half filled and completely filled d orbitals. It gives them stability and not get reduced.
Ni has high negative hydration enthalpy.
Therefore the value of standard electrode potential of Mn, Zn, Ni is more negative.
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