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Question
Give a reason for the following:
E° value for (Mn2+|Mn) is negative whereas for (Cu2+|Cu) is positive.
Solution
E° value for (Mn2+|Mn) is negative whereas for (Cu2+|Cu) is positive as the hydration enthalpy of Cu2+ ion is not sufficient to compensate the sum of sublimation as well as first and second ionization enthalpy of copper.
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