Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Electrolysis
198 practice questions
Topics covered
- Why things conduct electricity17 practice questions
- Passing electricity through compounds: electrolysis20 practice questions
- The electrolysis of molten compounds19 practice questions
- Electrolysis and redox19 practice questions
- The electrolysis of other molten substances19 practice questions
- The electrolysis of aqueous solutions18 practice questions
- The electrolysis of sodium chloride solution19 practice questions
- The electrolysis of copper(ii) sulfate solution using inert electrodes18 practice questions
- The electrolysis of some other solutions using inert electrodes19 practice questions
- What would happen with non-electrolytes?19 practice questions
Practice questions
141–150 of 198
Question 141
3 marks · Normal
Answer and see the solution →Copper is deposited at the cathode during the electrolysis of copper(II) sulfate solution with inert electrodes.
Question 142
3 marks · Normal
Answer and see the solution →Describe how the appearance and composition of copper(II) sulfate solution change after it is electrolysed for a long period using inert electrodes.
Question 143
4 marks · Normal
Answer and see the solution →The following table shows the observations at the electrodes during electrolysis of copper(II) sulfate solution with inert electrodes.
(a)[0 marks]Observations during Electrolysis Electrode Observation Cathode Pink/brown coating forms Anode Gas bubbles produced (b)[1 mark]Name the substance forming the pink/brown coating at the cathode.
(c)[1 mark]Name the gas produced at the anode.
(d)[2 marks]Suggest a simple test to confirm the identity of the gas collected at the anode.
Question 144
1 mark · Normal
Answer and check →Which of the following is the correct balanced half-equation for the reaction at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes?
- A.Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)
- B.2Cl^-(aq) \rightarrow Cl_2(g) + 2e^-
- C.4OH^-(aq) \rightarrow 2H_2O(l) + O_2(g) + 4e^-
- D.H^+(aq) + e^- \rightarrow H_2(g)
Question 145
2 marks · Normal
Answer and see the solution →Explain why oxygen gas is produced at the anode during the electrolysis of copper(II) sulfate solution with inert electrodes.
Question 146
4 marks · Normal
Answer and see the solution →Copper(II) sulfate solution is electrolysed using inert electrodes for a long time.
(a)[2 marks]Describe what happens to the colour of the solution.
(b)[2 marks]Explain why these changes occur.
Question 147
2 marks · Hard
Answer and see the solution →Write the balanced half-equation for the reaction that takes place at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes.
Question 148
5 marks · Hard
Answer and see the solution →A student performs the electrolysis of copper(II) sulfate solution using inert electrodes. Answer the following questions about the products at the electrodes.
(a)[1 mark]State the product formed at the cathode.
(b)[1 mark]State the product formed at the anode.
(c)[2 marks]Describe how you can identify the product formed at the anode during the electrolysis.
(d)[1 mark]What would you observe on the cathode after the electrolysis has run for a few minutes?
Question 149
2 marks · Hard
Answer and see the solution →Write the balanced half-equation for the reaction that takes place at the cathode when copper(II) sulfate solution is electrolysed using inert electrodes.
Question 150
1 mark · Easy
Answer and see the solution →State the ion that will produce oxygen gas at the anode, instead of a halogen, during the electrolysis of an aqueous solution.