3.1.11.1 Electrode potentials and cells Quiz: AQA Chemistry, Unit 1

The 20 questions

1. Which temperature is required for measuring standard electrode potentials?

   • 300 K
   • 373 K
   • 273 K
   • 298 K

2. By definition, what is the electrode potential of the standard hydrogen electrode?

   • +0.34 V
   • -0.76 V
   • +1.00 V
   • 0.00 V

3. What electrode potential value is assigned to the standard hydrogen electrode?

   • +1.00 V
   • -1.00 V
   • 0.00 V
   • +0.76 V

4. Using standard electrode potentials Zn2+/Zn = -0.76 V and Cu2+/Cu = +0.34 V, what is the EMF of the cell Zn|Zn2+||Cu2+|Cu?

   • +0.42 V
   • -1.10 V
   • +1.10 V
   • +0.76 V

5. Given E°(Zn2+/Zn) = -0.76 V and E°(Cu2+/Cu) = +0.34 V, which is the stronger reducing agent?

   • Zinc ions
   • Copper metal
   • Copper ions
   • Zinc metal

6. What is the EMF of a cell made from Fe2+/Fe (-0.44 V) and Cu2+/Cu (+0.34 V)?

   • -0.10 V
   • +0.78 V
   • +0.10 V
   • -0.78 V

7. With Ag+/Ag = +0.80 V and Zn2+/Zn = -0.76 V, what is the EMF of the cell Zn|Zn2+||Ag+|Ag?

   • +1.56 V
   • -1.56 V
   • +0.04 V
   • +1.04 V

8. By IUPAC convention, standard electrode potentials are written as which type of half-equation?

   • Oxidation
   • Neutralisation
   • Reduction
   • Combustion

9. In conventional cell notation, on which side is the oxidation half-cell written?

   • Left
   • Right
   • Top
   • Centre

10. Which is the correct conventional representation of a cell made from magnesium and silver, with Mg as the negative electrode?

    • Mg||Mg2+|Ag+||Ag
    • Mg|Mg2+||Ag+|Ag
    • Mg2+|Mg||Ag|Ag+
    • Ag|Ag+||Mg2+|Mg

11. Using Cl2/Cl- = +1.36 V and Fe3+/Fe2+ = +0.77 V, what is the EMF of a cell made from these two couples?

    • +0.59 V
    • +0.77 V
    • +2.13 V
    • -0.59 V

12. Which species is the strongest oxidising agent among chlorine, silver ions, and iodine?

    • Silver ions
    • Chloride ions
    • Iodine
    • Chlorine

13. Which metal is the strongest reducing agent among lithium, magnesium and iron?

    • Iron
    • Lithium
    • Lithium ions
    • Magnesium

14. What happens to electrode potential when ion concentrations are changed from standard conditions?

    • Value changes
    • Becomes zero
    • Remains unchanged
    • Always doubles

15. Why must a voltmeter measuring standard cell EMF have a high resistance?

    • Prevents ion movement
    • Minimises current drawn
    • Increases cell EMF
    • Maximises current drawn

16. What is the standard EMF for a cell with electrode potentials +0.77 V and +0.54 V?

    • -1.31 V
    • -0.23 V
    • +1.31 V
    • +0.23 V

17. Mg|Mg2+||Cu2+|Cu uses Mg2+/Mg = -2.37 V and Cu2+/Cu = +0.34 V. What is the EMF of this cell?

    • +0.34 V
    • -2.71 V
    • +2.71 V
    • +2.03 V

18. At which electrode does oxidation occur in a standard electrochemical cell?

    • Salt bridge
    • Positive electrode
    • Negative electrode
    • Voltmeter

19. If a cell has an EMF of +1.10 V, what is the EMF of the reversed cell?

    • +1.10 V
    • -2.20 V
    • -1.10 V
    • 0.00 V

20. In IUPAC convention, standard electrode potentials are always written for which process?

    • Reduction
    • Neutralisation
    • Oxidation
    • Combustion

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