Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Displacement reactions involving the halogens
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Potassium bromide solution is added to separate solutions of chlorine and iodine. Describe what you would observe in each case, and explain why these observations are different.
Question 2
5 marks · Hard
Answer and see the solution →A student adds solutions of bromine and iodine to separate samples of potassium chloride and potassium iodide. The results are summarised below:
Summary of Observed Colour Changes Added halogen solution Potassium chloride solution Potassium iodide solution Bromine No change Brown colour appears Iodine No change No change Use the information and your knowledge of halogen reactivity to answer the following.
(a)[1 mark]Write a balanced chemical equation for the reaction that occurs when bromine solution is added to potassium iodide solution.
(b)[2 marks]Explain why there is no reaction when bromine solution is added to potassium chloride solution.
(c)[2 marks]Describe and explain the difference in the observations when bromine and iodine solutions are added to potassium iodide solution.
Question 3
2 marks · Hard
Answer and see the solution →State and explain the trend in the reactivity of chlorine, bromine and iodine as shown by their displacement reactions.