Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Reactions of the halogens
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State the physical state and colour of chlorine and iodine at room temperature.
Question 2
4 marks · Normal
Answer and see the solution →This question is about the reactivity and displacement reactions of the halogens.
(a)[1 mark]Write a balanced equation for the reaction of chlorine with potassium bromide solution.
(b)[2 marks]Explain why this reaction happens.
(c)[1 mark]Name the type of reaction taking place in part (a).
Question 3
3 marks · Normal
Answer and see the solution →Explain, in terms of group trends, why iodine does not displace chlorine from a solution of sodium chloride. Include reference to reactivity and position in the group.
Question 4
4 marks · Normal
Answer and see the solution →The table below shows the appearance of three halogens at room temperature. Some data is missing. Complete the table.
Appearance of halogens at room temperature Halogen Physical state Colour Chlorine green Bromine red-brown Iodine Write your answers for the missing physical states and colour.
Question 5
1 mark · Normal
Answer and check →Which statement correctly explains why potassium iodide reacts with chlorine water?
- A.Chlorine is less reactive than iodine, so it is displaced by iodine.
- B.Iodine is more reactive than chlorine, so it displaces chlorine from the solution.
- C.Chlorine is more reactive than iodine, so it displaces iodine from potassium iodide.
- D.Iodine forms a stronger bond with potassium, so it replaces chlorine.
Question 6
2 marks · Normal
Answer and see the solution →State the colour change you would observe when chlorine gas is bubbled through a solution of potassium iodide.
Question 7
3 marks · Normal
Answer and see the solution →The melting and boiling points of the halogens increase down the group.
Chlorine is a gas at room temperature (25 B0C) and boils at 76 B0C. Bromine is a liquid at room temperature and boils at 59 B0C. Iodine is a solid at room temperature and sublimes at 84 B0C.
(a)[2 marks]Use the information above to state the physical state (solid, liquid or gas) of each halogen at room temperature (7F25 B0C).
(b)[1 mark]Explain, using the relative molecular mass and forces present, why the melting and boiling points increase from chlorine to iodine.
Question 8
4 marks · Normal
Answer and see the solution →The halogens react with metals and can also displace each other from solutions of their salts.
(a)[1 mark]State what is meant by a displacement reaction involving the halogens.
(b)[1 mark]Write a word equation for the reaction between bromine and potassium iodide solution.
(c)[2 marks]Explain why chlorine can displace bromine from sodium bromide solution, but iodine cannot.