A student pushes two graphite electrodes into solid potassium iodide and connects them to a direct current supply. No current flows and no products form.
Which change would allow the potassium iodide to be electrolysed?
Dissolving the potassium iodide in water
Using a power supply with a higher voltage
Replacing the graphite electrodes with platinum electrodes
Adding more solid potassium iodide around the electrodes
98 exam-style questions on OCR GCSE Chemistry 3.4 Electrolysis, covering 3.4.1 Products formed at the electrodes in electrolysis and 3.4.2 The technique of electrolysis. Each one has a worked solution and a mark scheme showing where the marks go.