Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Halogens
86 practice questions
Topics covered
Practice questions
41–50 of 86
Question 41
2 marks · Easy
Answer and see the solution →Write the balanced ionic equation, including state symbols, for the displacement reaction when chlorine gas is bubbled through a solution of sodium fluoride.
Question 42
2 marks · Easy
Answer and see the solution →Explain, in terms of electron transfer, why bromine acts as an oxidising agent in its reaction with iodide ions.
Question 43
3 marks · Easy
Answer and see the solution →The table shows the results of adding halogen solutions to different potassium halide solutions.
Observations of displacement reactions Halogen solution Potassium chloride Potassium bromide Potassium iodide Chlorine water — orange solution brown solution Bromine water — — brown solution Iodine solution — — — (a)[2 marks]State two observations from the table that provide evidence for displacement reactions.
(b)[1 mark]Identify the halide ion displaced by chlorine water from the solutions tested.
Question 44
1 mark · Easy
Answer and see the solution →State which species is reduced in the reaction between chlorine and potassium bromide.
Question 45
3 marks · Easy
Answer and see the solution →Complete the ionic equation for the reaction between bromine water and sodium iodide solution. Include state symbols.
(a)[1 mark]Write the products formed in the reaction.
(b)[2 marks]Write a balanced ionic equation, including state symbols, for the reaction.
Question 46
2 marks · Easy
Answer and see the solution →Bromine water is added to a solution of sodium iodide. Explain, in terms of electron transfer, why bromine acts as an oxidising agent in this reaction.
Question 47
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 48
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 49
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 50
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.