1
Quiz (Electrolysis)
Section A: Multiple Choice
1. During electrolysis, the electrolyte conducts electricity by the movement of
A. delocalized electrons. B. mobile cations and anions.
C. electrolyte particles. D. solvent particles.
2. A student used the following set-up to investigate the electrolysis of lead(II)
bromide. However, the bulb does not light up.
Which of the following modifications can make the bulb light up?
(1) Heat lead(II) bromide strongly until it melts
(2) Replace the graphite electrodes with platinum electrodes
(3) Add water to the solid
A. (1) only B. (2) only
C. (1) and (3) only D. (2) and (3) only
3. Which of the following statements about the electrolysis of concentrated
potassium iodide solution using graphite electrodes is correct?
A. A brown colour appears around the cathode.
B. The mass of the graphite electrodes increases.
C. The amount of potassium ions decreases.
D. The pH value of the resultant solution increases.
4. The following table shows the results of the electrolysis of a blue solution using
graphite electrodes.
Electrode
Result
Cathode
Some reddish brown solids form. The solid does not react
with dilute hydrochloric acid.
Anode
A gas with a choking smell evolves. The gas can turn
moist blue litmus paper red and then white.
The solution is probably
A. concentrated copper(II) chloride solution.
B. concentrated copper(II) sulphate solution.
C. concentrated sodium iodide solution.
D. concentrated sodium chloride solution.
graphite electrode
graphite electrode
lead(II) bromide
