In a blast furnace, iron is obtained by heating iron(III) oxide with carbon monoxide. Iron and carbon dioxide are formed.
Fe2O3+3CO→2Fe+3CO2 \mathrm{Fe_2O_3 + 3CO \rightarrow 2Fe + 3CO_2} Fe2O3+3CO→2Fe+3CO2Iron(III) oxide contains Fe3+\mathrm{Fe^{3+}}Fe3+ ions. The iron atoms formed have no charge.
Name the substance that is reduced.
Give the reason, in terms of oxygen, why carbon monoxide is oxidised.
Each Fe3+\mathrm{Fe^{3+}}Fe3+ ion becomes an iron atom.
State whether each Fe3+\mathrm{Fe^{3+}}Fe3+ ion gains or loses electrons, and how many electrons.
112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.