Aluminium is extracted by the electrolysis of aluminium oxide.
Statement 1: The aluminium oxide must be molten or dissolved so that its ions are free to move.
Statement 2: Aluminium is formed at the anode (positive electrode).
Statement 3: The anodes are made of carbon and must be replaced because they react with the oxygen that is formed.
Which statements are correct?
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
61 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.