Question

In the extraction of aluminium:
(i) Name the process of concentration of bauxite
(ii) Write the cathode reaction in electrolytic reduction of alumina
(iii) write the function and formula of cryolite in the extraction of aluminium.
(iv) Draw the diagram of extraction of aluminium.

Answer 1

(i) The name of the process of concentration of bauxite is Bayer process.
(ii) Reaction of Cathode : $A{l}^{3+}+3e^{-}\to Al$.
(iii) The formula of cryolite is $\left(Al{F}_3.3NaF\right)$. Cryolite is added to the molten mixture of alumina to reduce the melting point.
(iv) Diagram is shown.