Electrolysis — Paper 2 · IGCSE Sciences - Co-ordinated (9-1) 0973

17 What is the electrolyte that is used when a nickel spoon is electroplated with copper? A copper B copper sulfate solution C nickel sulfate solution D nickel

1 marks

Answer: B

This question in 0973/21 May/June 2019

18 Which row identifies the products of the electrolysis of the named electrolyte using carbon electrodes? product at product at electrolyte anode cathode A aqueous copper(II) sulfate oxygen copper B concentrated aqueous sodium chloride chlorine sodium C dilute sulfuric acid hydrogen oxygen D molten potassium bromide potassium bromine

1 marks

Answer: A

This question in 0973/22 May/June 2019

18 During the electrolysis of aluminium oxide, which ions are reduced and at which electrode does this reduction occur? A aluminium ions at the anode B aluminium ions at the cathode C oxide ions at the anode D oxide ions at the cathode

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2019

17 The diagram shows the electrolysis of lead(II) bromide using inert electrodes. coloured fumes electrode X electrode Y grey solid electrolyte Which statement about this experiment is correct? A Electrode X is positively charged. B The coloured fumes are produced at the negative electrode. C The electrolyte is lead(II) bromide. D The grey solid is lead(II) bromide.

1 marks

Answer: C

This question in 0973/21 May/June 2020

17 The diagram shows the electrolysis of lead(II) bromide using inert electrodes. coloured fumes electrode X electrode Y grey solid electrolyte Which statement about this experiment is correct? A Electrode X is positively charged. B The coloured fumes are produced at the negative electrode. C The electrolyte is lead(II) bromide. D The grey solid is lead(II) bromide.

1 marks

Answer: C

This question in 0973/22 May/June 2020

16 Aqueous copper(II) sulfate is electrolysed using copper electrodes. What is the half-equation for the reaction at the cathode? A Cu + 2e–  Cu2+ B Cu  Cu2+ + 2e– C Cu2+ + 2e–  Cu D Cu2+  Cu + 2e–

1 marks

Answer: C

This question in 0973/22 May/June 2021

16 The diagram shows the electrolysis of a compound. switch + – P Q electrolyte When the switch is closed, the solution around electrode P turns orange because a halogen is formed. The positive electrode P is called the ……1……, and the halogen is ……2…… . Which words complete gaps 1 and 2? 1 2 A anode bromine B anode chlorine C cathode bromine D cathode chlorine

1 marks

Answer: A

This question in 0973/21 Oct/Nov 2021

17 Aqueous copper(II) sulfate is electrolysed using inert electrodes. Which statement about this electrolysis is correct? A Copper ions are attracted to the cathode. B Electrons move from the cathode to the anode. C Electrolyte ions are oxidised at the cathode. D Sulfate ions are reduced to sulfur dioxide.

1 marks

Answer: A

This question in 0973/21 May/June 2022

17 Which statement about electrolysis is correct? A At the anode, anions are oxidised by gaining electrons. B At the anode, cations are reduced by gaining electrons. C At the cathode, anions are oxidised by gaining electrons. D At the cathode, cations are reduced by gaining electrons.

1 marks

Answer: D

This question in 0973/22 May/June 2022

18 Copper(II) sulfate can be electrolysed using either carbon electrodes or copper electrodes. What happens to the concentration of copper(II) ions in the electrolyte during electrolysis using these electrodes? using carbon using copper electrodes electrodes A decreases decreases B decreases no change C no change decreases D no change increases

1 marks

Answer: B

This question in 0973/21 Oct/Nov 2022

18 Sodium hydroxide is manufactured by the electrolysis of concentrated aqueous sodium chloride. During the process, a gas is given off at each electrode and the aqueous sodium hydroxide collects around one of the electrodes. Which row identifies the gas at each electrode and the electrode around which the aqueous sodium hydroxide collects? electrode at which at the anode at the cathode sodium hydroxide collects A chlorine hydrogen cathode B chlorine hydrogen anode C oxygen chlorine cathode D oxygen chlorine anode

1 marks

Answer: A

This question in 0973/21 May/June 2023

18 Which statement about the extraction of aluminium from its ore by electrolysis is correct? A Aluminium gains electrons from the anode. B Aluminium ions are oxidised at the cathode. C Aluminium ore is called cryolite. D Aluminium oxide is in the electrolyte.

1 marks

Answer: D

This question in 0973/22 May/June 2023

19 Two electrolysis experiments are done using inert electrodes. Experiment 1 is the electrolysis of aqueous copper(II) sulfate. Experiment 2 is the electrolysis of molten lithium bromide. Which row describes the products at each electrode in these experiments? experiment 1 experiment 2 cathode anode cathode anode A copper oxygen bromine lithium B oxygen copper lithium bromine C copper oxygen lithium bromine D oxygen copper bromine lithium

1 marks

Answer: C

This question in 0973/21 May/June 2024

17 Aqueous copper(II) sulfate is electrolysed using carbon electrodes. What is the ionic half-equation for the reaction at the cathode? A Cu2+ + 2e–  Cu B 2H+ + 2e–  H2 C Cu  Cu2+ + 2e– D 4OH–  O2 + 2H2O + 4e–

1 marks

Answer: A

This question in 0973/22 May/June 2024

18 Which statement describes what happens during electrolysis? A Covalent compounds produce more complex substances. B Covalent compounds produce simpler substances. C Ionic compounds produce more complex substances. D Ionic compounds produce simpler substances.

1 marks

Answer: D

This question in 0973/21 Oct/Nov 2024

21 Which gas is formed at the cathode during electrolysis? A carbon dioxide B chlorine C hydrogen D oxygen

1 marks

Answer: C

This question in 0973/21 May/June 2025

16 During electrolysis, reactions occur at the cathode and anode. Which statements about the electrode reactions are correct? 1 At the anode, anions gain electrons and are reduced. 2 At the anode, anions lose electrons and are oxidised. 3 At the cathode, cations gain electrons and are reduced. 4 At the cathode, cations lose electrons and are oxidised. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0973/21 Oct/Nov 2025