Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Halogens
86 practice questions
Topics covered
Practice questions
21–30 of 86
Question 21
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 22
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 23
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 24
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 25
1 mark · Easy
Answer and see the solution →Complete the word equation for the reaction: potassium iodide + chlorine → ___ + ___
Question 26
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 27
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.
Question 28
2 marks · Normal
Answer and see the solution →State what you would observe when chlorine water is added to a solution of potassium iodide. Write the chemical equation for the reaction.
Question 29
4 marks · Normal
Answer and see the solution →A student investigates the reactivity of three halogens: chlorine, bromine and iodine, using solutions of their salts.
(a)[2 marks]Explain, with an equation, what happens when bromine solution is added to potassium iodide solution.
(b)[2 marks]The student adds iodine solution to potassium chloride solution. State and explain the observation.
Question 30
3 marks · Normal
Answer and see the solution →Explain why chlorine can displace bromine from potassium bromide solution, but bromine cannot displace chlorine from potassium chloride solution. In your answer, refer to the reactivity trend of halogens.