Electrode potentials and cells Quiz
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5 questions, one answer each
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1. E°(Mg²⁺/Mg) = −2.37 V and E°(Ag⁺/Ag) = +0.80 V. What is the EMF of the cell Mg | Mg²⁺ || Ag⁺ | Ag?
- A. +1.57 V
- B. −3.17 V
- C. +3.17 V
- D. +2.37 V
2. E° values: Zn²⁺/Zn −0.76 V, Cu²⁺/Cu +0.34 V, Ag⁺/Ag +0.80 V. Which metal is the strongest reducing agent?
- A. Zn
- B. Cu
- C. Ag
- D. They are equal
3. What does || represent in a cell diagram?
- A. A phase boundary
- B. A salt bridge
- C. A platinum electrode
- D. The direction of electron flow
4. A cell has an EMF of −0.25 V as written. What does this show?
- A. The reaction as written is not feasible
- B. The cell is at equilibrium
- C. The reaction is very fast
- D. The cell is a SHE
5. Which is a standard condition for electrode potentials?
- A. Temperature of 273 K
- B. Pressure of 100 kPa
- C. Ion concentration of 0.10 mol dm⁻³
- D. Pressure of 1 kPa