(a(i))[1]
Balance the equation for the reaction when iron pyrites reacts with oxygen in air. [BLANK]FeS$_2$ + [BLANK]O$_2$ $\rightarrow$ [BLANK]Fe$_2$O$_3$ + [BLANK]SO$_2$
(a(ii))[1]
State the name of Fe$_2$O$_3$. Give the oxidation number of iron.
(b(i))[1]
Ignoring cost, explain why a temperature above $450^\circ\text{C}$ is not chosen.
(b(ii))[1]
Explain why a pressure below $2\,$atm is not chosen.
(c)[2]
Write the symbol equation for the reaction.
(d(i))[1]
Name a solution that may be mixed with aqueous ammonium sulfate to make a precipitate of lead(II) sulfate.
(d(ii))[3]
Write an ionic equation for this precipitation reaction. Add state symbols.
(d(iii))[3]
Describe how pure lead(II) sulfate may be obtained from the mixture.