
Electrolysis: Key Concepts and Applications IGCSE
Authored by Gareth Hart
Chemistry
10th Grade
Used 2+ times

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18 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is produced at the anode during the electrolysis of molten sodium chloride?
Sodium
Chlorine
Hydrogen
Oxygen
Answer explanation
During the electrolysis of molten sodium chloride, sodium ions migrate to the cathode and gain electrons to form sodium metal, while chloride ions lose electrons at the anode, producing chlorine gas.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During the electrolysis of copper(II) sulfate solution using copper electrodes, what happens to the mass of the anode?
It increases
It decreases
It remains the same
It doubles
Answer explanation
During electrolysis, copper ions from the anode dissolve into the solution, causing the mass of the anode to decrease. Therefore, the correct answer is that the mass of the anode decreases.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main product at the cathode during the electrolysis of water?
Oxygen
Hydrogen
Chlorine
Sodium
Answer explanation
During the electrolysis of water, water molecules are split into hydrogen and oxygen. At the cathode, reduction occurs, producing hydrogen gas as the main product, while oxygen is produced at the anode.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the anode in electrolysis?
To supply electrons to the solution
To collect electrons from the solution
To provide a surface for the reaction
To act as a catalyst
Answer explanation
In electrolysis, the anode collects electrons from the solution, facilitating oxidation reactions. This is crucial for the overall process, as it allows the flow of current and drives the chemical reactions at the electrodes.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is an application of electrolysis?
Distillation
Electroplating
Filtration
Evaporation
Answer explanation
Electrolysis is used in electroplating, which involves depositing a layer of metal onto a surface using electric current. This process enhances appearance and prevents corrosion, making electroplating a key application of electrolysis.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is produced at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes?
Copper
Sulfur dioxide
Oxygen
Hydrogen
Answer explanation
During the electrolysis of copper(II) sulfate solution with inert electrodes, water is oxidized at the anode, producing oxygen gas. Therefore, the correct answer is oxygen.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During the electrolysis of copper(II) sulfate solution, how will the pH of the electrolyte change?
It will become neutral
It will increase
It will decrease
There will be no observable change
Answer explanation
During the electrolysis of copper(II) sulfate solution with inert electrodes, water is oxidized at the anode, producing oxygen gas and copper ions are reduced forming copper. This will leave H+ ions and SO42- ions in solution. This is sulfuric acid, so the pH is lowered (low pH i.e. below 7 is acidic).
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