JEE Main2012ChemistryElectrochemistryActual
Given E _ Cu ²⁺ / Cu ^ =0.34 ~V , E _ Cu ²⁺ / Cu ^ =0.15 ~V Standard electrode potential for the half cell Cu ⁺ / Cu is
Options
- A0.38 ~V
- B0.53 ~V
- C0.19 ~V
- D0.49 ~V
Correct answer
B. 0.53 ~V
Step-by-step solution
aligned & Cu ⁺⁺+e⁻ Cu ⁺ ; & E₁^0=0.15 ~V ; G₁^0=-n₁ E₁^0 F & Cu ²⁺+2 e Cu ; & E₂^0=0.34 ~V ; G₂^0=-n₂ E₂^0 F & aligned On subracting eq.(i) from eq. (ii) we get aligned & Cu ⁺+e⁻ Cu ; G^0= G₂^0- G₁^0 &-n E^0 F=- (n₂ E^0 F-n₁ E₁^0 F ) & E^0= n₂ E₂^0 F-n₁ E₁^0 F n F &= 2 0.34-0.15 1 &=0.53 ~V aligned