Manipal MET2021ChemistryElectrochemistry
The standard reduction potential for Fe ²⁺ / Fe and Sn ²⁺ / Sn electrodes are -0.44 and -0.14 volt respectively. For the cell reaction Fe ²⁺+ Sn F _ e + Sn ²⁺ , the standard emf is
Options
- A+0.30 V
- B-0.58 V
- C+0.58 V
- D-0.30 V
Correct answer
D. -0.30 V
Step-by-step solution
For the cell reaction, Fe acts as cathode and Sn as anode Hence, aligned E_ cell ^ & =E_ cathode ^ -E_ anode ^ & =-0.44-(-0.14)=-0.30 ~V aligned The negative emf suggests that the reaction goes spontaneously in reversed direction.