A solution containing equal concentrations of Cu²⁺, Ag⁺, and Zn²⁺ is electrolyzed at low current.
Which cation is preferentially reduced first at the cathode?
- A
Zn²⁺
- Bcheck_circle
Ag⁺ (highest E°)
- C
Cu²⁺
- D
All three plate simultaneously
Explanation
The cation with the most positive reduction potential is reduced first; Ag⁺ at +0.80 V plates before Cu²⁺ or Zn²⁺.