•(ii) Write an equation for the reduction of zinc
oxide by carbon. [2]
•(iii) The boiling point of lead is 1740
°C and that of zinc is 907 °C. Explain why, when both oxides are reduced
by heating with carbon at 1400 °C, only lead remains in the
furnace. [2]
4. J03/3/1. No one knows
where iron was first isolated. It appeared in China, the Middle
East and in Africa. It was obtained by reducing iron ore
with charcoal.