Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Displacement reactions as redox reactions
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Write the ionic equation, with state symbols, for the displacement reaction between bromine water and potassium iodide solution.
Question 2
4 marks · Normal
Answer and see the solution →Chlorine water is added to a solution of potassium bromide.
(a)[1 mark]State what you would see when chlorine water is added to potassium bromide solution.
(b)[2 marks]Explain why this reaction is an example of a redox reaction. Refer to oxidation and reduction in your answer.
(c)[1 mark]Name the oxidising agent in this reaction.
Question 3
3 marks · Normal
Answer and see the solution →Explain, in terms of electron transfer, why iodine does not displace bromine from a solution of potassium bromide. Include references to oxidation and reduction in your answer.
Question 4
4 marks · Normal
Answer and see the solution →The table shows observations from adding different halogen solutions to various potassium halide solutions:
Results of mixing halogen solutions and potassium halide solutions Halogen solution Potassium halide solution Observation Chlorine Potassium iodide Brown solution formed Bromine Potassium chloride No change Iodine Potassium bromide No change Chlorine Potassium bromide Orange solution formed (a)[1 mark]Identify which pairs in the table show a displacement reaction.
(b)[2 marks]For one of the pairs that show a displacement, write the ionic equation for the reaction.
(c)[1 mark]Explain why no change is observed in the reaction between bromine and potassium chloride.
Question 5
1 mark · Normal
Answer and check →Which statement correctly explains why chlorine acts as an oxidising agent in its reaction with bromide ions?
- A.It loses electrons and is oxidised itself.
- B.It gives electrons to bromide ions.
- C.It gains electrons and is reduced.
- D.It forms a brown solution.
Question 6
2 marks · Normal
Answer and see the solution →Complete the ionic equation for the reaction between bromine and sodium iodide solution. Include state symbols.
Question 7
4 marks · Normal
Answer and see the solution →Two students discuss the reaction between chlorine and potassium iodide solution.
(a)[2 marks]Write the ionic equation for this reaction, including state symbols.
(b)[2 marks]Explain, using the meanings of oxidation and reduction, which substance is oxidised and which is reduced in this reaction.
Question 8
3 marks · Normal
Answer and see the solution →Chlorine gas is bubbled through a solution of sodium iodide. Write the balanced ionic equation for this reaction. Show, with working, the steps you use to remove spectator ions from the full ionic equation.