Consider the standard electrode potential values(M2+/M) of the elemen

1.	Consider the standard electrode potential values(M2+/M) of the elements of the first transition series.TiVCrMnFe-1.63-1.18-0.90-1.18-0.44CoNiCuZn-0.28-0.25+0.34-0.76Explain:(i) E0 value for copper is positive.(ii) E0 value of Mn is more negative as expected from the trend(iii) Cr3+ is a stronger reducing agent than Fe2+.
Answer» (i) The high energy to transform Cu(s) to Cu²⁺ (aq) is not balanced by its hydration enthalpy. (ii) Mn²⁺ has d⁵ configuration (stable half-filled configuration) (iii) d⁵ to d³occurs in case of Cr²⁺ to Cr³⁺. More stable t³2g) while it change from d⁶ to d⁵ in case of fe²⁺ to fe^3+.

Consider the standard electrode potential values(M2+/M) of the elements of the first transition series.TiVCrMnFe-1.63-1.18-0.90-1.18-0.44CoNiCuZn-0.28-0.25+0.34-0.76Explain:(i) E0 value for copper is positive.(ii) E0 value of Mn is more negative as expected from the trend(iii) Cr3+ is a stronger reducing agent than Fe2+.

Answer»

(i) The high energy to transform Cu(s) to Cu²⁺ (aq) is not balanced by its hydration enthalpy.

(ii) Mn²⁺ has d⁵ configuration (stable half-filled configuration)

(iii) d⁵ to d³occurs in case of Cr²⁺ to Cr³⁺. More stable t³2g) while it change from d⁶ to d⁵ in case of fe²⁺ to fe^3+.