7(ii)
Answer the following questions with reference to the concentration of bauxite ore.
(a) Name the process used to concentrate the ore.
(b) Give a balanced chemical equation for the conversion of aluminium hydroxide to pure alumina.
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(a) Bayer's process is used to concentrate bauxite ore to alumina.
(b)
$2\text{Al(OH)}_3 \xrightarrow{1000 ^{\circ}\text{C}} \text{Al}_2\text{O}_3 + 3\text{H}_2\text{O}$