Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Displacement reactions as redox reactions
19 practice questions
Practice questions
11–19 of 19
Question 11
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 12
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 13
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 14
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 15
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 16
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.
Question 17
2 marks · Hard
Answer and see the solution →Write the balanced ionic equation, including state symbols, for the reaction that occurs when chlorine gas is bubbled through a solution containing sodium bromide. Do not include spectator ions.
Question 18
5 marks · Hard
Answer and see the solution →Iodine solution is added to potassium chloride solution. No reaction is observed. Consider the redox processes involved in displacement reactions between halogens and halide ions.
(a)[2 marks]Explain, in terms of electron transfer, why iodine does not displace chloride ions from potassium chloride solution.
(b)[2 marks]A reaction does occur when bromine water is added to potassium iodide solution. State which species is oxidised and which is reduced in this reaction.
(c)[1 mark]Write the balanced ionic equation, including state symbols, for the reaction between bromine solution and iodide ions.
Question 19
2 marks · Hard
Answer and see the solution →Complete the ionic equation, including state symbols, for the reaction of fluorine gas with potassium bromide solution.