A bulb lights up while molten lead bromide is electrolysed. Why does the bulb go out when the lead bromide solidifies?
The ions can no longer move through the solid
The electrons can no longer move through the solid
The ions lose their charges as the solid forms
The bonds in the solid have all been broken
40 exam-style questions on AQA GCSE Chemistry 4.3 Electrolysis, covering 4.3.1a The process of electrolysis, 4.3.1b Half equations in electrolysis, 4.3.2 Electrolysis of molten ionic compounds, 4.3.3 Using electrolysis to extract metals, 4.3.4 Electrolysis of aqueous solutions, and 4.3.5 Representation of reactions at electrodes as half equations. Each one has a worked solution and a mark scheme showing where the marks go.