EΘ of Cu is +0.34V while that of Zn is —0.76 V. Explain. 

NEETprep Answer: EΘ value of Cu is positive because of the fact that sum of sublimation enthalpy and ionisation enthalpy to convert Cu(s) to Cu2+(aq) is so high thatit is not compensatebyits hydration enthalpy. E° value for Zn is negative because of the fact that after removal of electrons from 4s orbital, stable 3d10 configuration is obtained,