Aluminium costs much more to extract than iron does. Which is the best explanation for this?
Aluminium ore is much rarer in the Earth than iron ore is.
Aluminium has a much higher melting point than iron has.
Aluminium must be obtained by electrolysis, which uses a lot of energy.
Aluminium oxide contains a smaller percentage of metal than iron oxide.
39 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons. Each one has a worked solution and a mark scheme showing where the marks go.