COMEDK2016ChemistryElectrochemistry
Aluminium displaces hydrogen from dilute HCl , whereas silver does not. The emf of a cell prepared by combining Al / Al ³⁺ and Ag / Ag ⁺ is 2.46 ~V . The reduction potential of silver electrode is +0.80 ~V . The reduction potential of aluminium electrode is
Options
- A3.26 ~V
- B-1.66 ~V
- C+1.66 ~V
- D-3.26 ~V
Correct answer
B. -1.66 ~V
Step-by-step solution
E^ =E_ ( Ag ⁺ / Ag ) ^ -E_ ( Al aligned &2.46=0.80-E_ ( Al ³⁺ / Al ) ⁰ & E_ ( Al ³⁺ / Al ) ⁰=-1.66 ~V aligned Reduction potential =-1.66 ~V .