Carbon is used to obtain a metal, M, from its oxide. The equation for the reaction is 2MO+C→2M+CO22\text{MO} + \text{C} \rightarrow 2\text{M} + \text{CO}_22MO+C→2M+CO2. Which statement correctly identifies a reduction in this reaction?
The metal oxide is reduced because it gains carbon.
The carbon dioxide is reduced because it contains oxygen.
The metal oxide is reduced because it loses oxygen.
The carbon is reduced because it removes oxygen.
86 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.