Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Oxidation and reduction
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →In the equation below, which species is oxidised? State your answer as the formula.
Question 2
3 marks · Easy
Answer and see the solution →Complete the following sentences about oxidation and reduction in terms of oxygen transfer.
(a)[1 mark]A substance is oxidised if it ___ oxygen.
(b)[1 mark]A substance is reduced if it ___ oxygen.
(c)[1 mark]In the reaction: , name the substance that is reduced.
Question 3
2 marks · Easy
Answer and see the solution →The equation below represents a reaction: \[ 2Ag_2O \rightarrow 4Ag + O_2 \] State the oxidising agent and the reducing agent in this reaction.
(a)[1 mark]Identify the oxidising agent.
(b)[1 mark]Identify the reducing agent.
Question 4
2 marks · Easy
Answer and see the solution →Explain in terms of electrons what happens to sodium in the following reaction:
Question 5
3 marks · Easy
Answer and see the solution →The table shows whether substances gain or lose oxygen in a reaction.
Substance Oxygen gained/lost A gains oxygen B loses oxygen C no change (a)[1 mark]Which substance is being oxidised?
(b)[1 mark]Which substance is being reduced?
(c)[1 mark]State the meaning of oxidation in terms of oxygen transfer.
Question 6
1 mark · Easy
Answer and see the solution →In a reaction, chlorine gas (Cl_2) acts as an oxidising agent. What does it do in terms of oxygen transfer?
Question 7
3 marks · Easy
Answer and see the solution →The following equation shows a redox reaction: Describe, in terms of electrons, what happens to:
(a)[1 mark]the zinc atoms
(b)[1 mark]the copper ions
(c)[1 mark]State which is oxidised and which is reduced.
Question 8
2 marks · Easy
Answer and see the solution →A student heats 5.0 g of lead in a stream of oxygen and forms 5.4 g of lead(II) oxide, according to the equation:
Calculate the mass of oxygen that has combined with the lead. State, in terms of oxygen transfer, what has happened to the lead.
Question 9
2 marks · Normal
Answer and see the solution →State what happens to a substance during oxidation and what happens to a substance during reduction in terms of oxygen transfer.
Question 10
4 marks · Normal
Answer and see the solution →(a)[2 marks]Copper(II) oxide reacts with hydrogen gas:
Identify the substance that is reduced and the substance that is oxidised in this reaction.
(b)[2 marks]Name the oxidising agent and the reducing agent in this reaction.