Q. 22 B5.0( 1 Vote )
Consider the stan
(i) Eo value of Cu is positive due to the fat that the sum of sublimation enthalpy an ionization enthalpy to convert Cu(s) to Cu2+ (aq) is so high that it is not balanced by its hydration enthalpy.
(ii) Eo value of Mn is more negative than expected value is due to the fact that after removal of electrons from 4s orbital, Mn2+ has d5 configuration which is a stable half-filled configuration.
(iii) d4 to d5 occurs in case of Cr2+ to Cr3+. It has means it has more stable t32g (half filled) whereas the configuration changes from d6 to d5 in case of Fe2+ to Fe3+.
Thus, Cr2+ is a stronger reducing agent than Fe2+
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