A student electrolyses potassium bromide solution using inert electrodes. The student writes three statements for a risk assessment.
Statement 1: a toxic substance forms at the anode, so the electrolysis should be done in a fume cupboard or a well-ventilated room
Statement 2: a flammable gas forms at the cathode, so naked flames should be kept away from the apparatus
Statement 3: potassium forms at the cathode, so there is a risk of it reacting violently with the water in the solution
Which statements are correct?
1 only
2 and 3 only
1, 2 and 3
1 and 2 only
47 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.