MHT CET2010ChemistryElectrochemistry
Oxidation potential of unimoles of calomel is
Options
- A+0.25 ~V
- B0.00 ~V
- C+0.287 ~V
- D-0.28 ~V
Correct answer
D. -0.28 ~V
Step-by-step solution
Calomel is used as a secondary reference electrode. Since Hg is less reactive than H , its standard reduction potential is positive. Hence, its standard oxidation potential must be negative, i e,-0.28 ~V . [As standard reduction potential = - standard oxidation potential.]