State the name of the principal iron ore used in the blast furnace.
State how the main source of heat is supplied in the blast furnace.
Name the gaseous reducing agent in the blast furnace.
Write a symbol equation for the reduction of iron(III) oxide by the gaseous reducing agent in (a)(iii).
Write two symbol equations to show how limestone removes silicon(IV) oxide from iron ore.
Explain why A, B, C and D are isotopes of iron.
Complete Table 2.2 to show the numbers of protons, neutrons and electrons in the two iron ions shown.
Describe a test for aqueous $\mathrm{Fe}^{2+}$ ions. Give the test and the observations.
Define the term oxidising agent.
Explain why the conversion of $\mathrm{Fe}^{2+}$ ions to $\mathrm{Fe}^{3+}$ ions is described as oxidation.
State one condition needed for the oxidation to occur.
Suggest the identity of the other product produced in this reaction.