Red Lead, $$\mathrm{Pb_3O_4}$$ is used in paints. It protects metal surfaces against corrosion. Red lead is made by heating lead (II) oxide, PbO, in air.<br>a) Copy out and balance the following equation<br>$$\mathrm{PbO + O_2 \rightarrow Pb_3O_4}$$<br>b) Red lead paint may be used to protect iron from rusting. Name two other ways of stopping iron or steel from rusting.<br>c) On strong heating, red lead decomposes to form oxygen and lead (II) oxide.<br>i) How could you show that oxygen is given off in the decomposition?<br>ii) Suggest how you could show when the decomposition was finished.<br>d) Red lead reacts with concentrated hydrochloric acid to form lead (II) chloride, chlorine and water.<br>$$\mathrm{Pb_3O_4 + 8HCl \rightarrow 3PbCl_2 + Cl_2 + 4H_2O}$$<br>i) Describe how you could show that chlorine was given off during the reaction.<br>ii) Suggest how, using an electrical method, you could obtain lead from lead (II) chloride.