Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Displacement reactions involving the halogens
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the colour change you would see when chlorine water is added to potassium bromide solution.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]What is observed when bromine water is added to a solution of potassium iodide?
(b)[1 mark]Write the balanced chemical equation for the reaction.
(c)[1 mark]State why this reaction occurs, using the reactivity trend of the halogens.
Question 3
2 marks · Easy
Answer and see the solution →A student adds excess bromine water to 0.050 mol of potassium iodide solution. Calculate the maximum amount (in mol) of iodine that can be formed.
Question 4
2 marks · Easy
Answer and see the solution →Explain, using the reactivity trend, why chlorine can displace iodine from potassium iodide solution but iodine cannot displace chlorine from potassium chloride solution.
Question 5
3 marks · Easy
Answer and see the solution →A student added samples of chlorine, bromine and iodine solutions to three separate solutions of potassium chloride, potassium bromide and potassium iodide. The table shows her results:
Colour change observations for halogen displacement reactions Halogen solution added Potassium chloride Potassium bromide Potassium iodide Chlorine - orange brown Bromine - - brown Iodine - - - (a)[1 mark]Which solution gave a brown colour when iodine was present? Name the halogen displaced.
(b)[2 marks]Which is the most reactive halogen in this experiment? Explain your answer.
Question 6
1 mark · Easy
Answer and see the solution →Complete the word equation for the reaction: potassium iodide + chlorine → ___ + ___
Question 7
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the most reactive halogen out of chlorine, bromine, and iodine.
(b)[1 mark]Describe what happens when iodine solution is added to potassium bromide solution.
(c)[1 mark]Explain your answer to part (b).
Question 8
2 marks · Easy
Answer and see the solution →The following reaction occurs: 2KBr(aq) + Cl2(aq) -> 2KCl(aq) + Br2(aq) If 0.10 mol of chlorine reacts with excess potassium bromide, calculate the maximum amount in mol of bromine formed.