COMEDK2014ChemistryElectrochemistry
The standard emf of the cell Zn | Zn ²⁺ | | Ag ⁺ | Ag is 1.56 ~V . If the standard reduction potential of Ag is 0.8 ~V , the standard oxidation potential of Zn is
Options
- A-0.76 ~V
- B+0.76 ~V
- C-2.36 ~V
- D+2.36 ~V
Correct answer
B. +0.76 ~V
Step-by-step solution
For the cell, Zn | Zn ²⁺ | Ag ⁺ | Ag E_ cell ^ =E_ cathode ^ -E_ anode ^ 1.56 ~V =E_ Ag ⁺ / Ag ⁰-E_ Zn ²⁺ / Zn ⁰E_ Zn ²⁺ / Zn ^ =-0.76 ~V E_ Zn / Zn ²⁺ ^ =-E_ Zn ²+/ Zn ^ =-(-0.76)=+0.76 ~V