A student is provided with solutions of three halogens: chlorine water, bromine water, and iodine solution. They also have solutions of three potassium halide salts: potassium chloride, potassium bromide, and potassium iodide. Explain how the student could use these solutions to carry out displacement reactions, describing the observations they would make and explaining how these results show the order of reactivity of chlorine, bromine, and iodine.
106 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.