(a)   Outline the procedures for the treatment of water for town supply.   

 

(b) (i)  State two main impurities present in bauxite.
(ii)  Give one reason why bauxite is usually preferred as the ore for the extraction of aluminium.
(iii)   Outline the manufacture of aluminium form purified bauxite.            

(c) (i)  Explain briefly the term fine chemical industry.
(ii)  State two differences between a fine chemical and a heavy chemical.

(d) (i)  Write a balanced chemical equation for the combustion of coal.
(ii)   If 5.4 g of coal is burnt completely, calculate the amount of oxygen measured at s.t.p. that would be required for the combustion.
[C = 12.0, O = 16.0, Molar volume of a gas at s.t.p. = 22.4 dm\(^3\)]        

(e) Name two substances which can be used as electrodes during the electrolysis of acidified water.