of
Cu is +0.34V while that of Zn is -0.76 V. Explain.
Answer:
value
of Cu is positive because of the fact that sum of sublimation enthalpy and ionisation
enthalpy to convert Cu(s) to 
is so high that
it is not compensate by its hydration enthalpy 
value
for Zn is negative because of the fact that after removal of electrons from 4s
orbital, stable 
configuration is
obtained.
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