Question

(i) Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.
(ii) Name the process by which impure ore of aluminium gets purified by using concentrated solution of an alkali.
(iii) Write the equation for the formation of aluminium at the cathode during the electrolysis of alumina.

Answer 1

(i) Bauxite is the most common ore of aluminium. Its chemical formula is $A{l}_2{O}_3.2H_{2}O$

(ii) Bayer's process

(iii) Reaction at cathode:

${Al}^{3+}\left(aq\right)+3e^{-}\to Al\left(s\right)$