Write a balanced chemical equation for – (i) The formation of aluminium at the cathode, during the electrolysis of alumina. (ii) Action of heat on aluminium hydroxide.

(i) At cathode : 2Al3+ + 6e– ⟶ 2Al

(ii) Conversion of Al(OH)3 – to pure alumina – heat on Al(OH)3

2Al (OH)3 {\overset{1100^o C}{\longrightarrow}} Al2O3 + 3H2O

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