KCET2009ChemistryElectrochemistry
The standard electrode potential for the half-cell reactions are aligned & Zn ²⁺+2 e ⁻ Zn ; E ^ =-0.76 ~V & Fe ²⁺+2 e ⁻ Fe ; E ^ =-0.44 ~V aligned The emf of the cell reaction, Fe ²⁺+ Zn Zn ²⁺+ Fe is
Options
- A-0.32 ~V
- B-1.20 ~V
- C+1.20 ~V
- D+0.32 ~V
Correct answer
D. +0.32 ~V
Step-by-step solution
Zn ²⁺+2 e ⁻ Zn ; E ^ =-0.76 ~V Fe ²⁺+2 e ⁻ Fe ; E ^ =-0.44 ~V Cell reaction is aligned Fe ²⁺+ Zn Zn ²⁺+ Fe E _ cell &= E _ cathode - E _ anode &=-0.44-(-0.76) &=-0.44+0.76 &=0.32 ~V aligned