A student investigates the electrolysis of potassium iodide using inert electrodes. The student first uses potassium iodide dissolved in water, then repeats the investigation using molten potassium iodide.
State the products formed at each electrode when the potassium iodide is dissolved in water.
State the product at the cathode when molten potassium iodide is used. Explain why it differs from the product at the cathode when potassium iodide is dissolved in water.
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.