Question

state the principle for extraction of aluminium ​

Answer 1

 Aluminium is extracted by electrolysis. The ore is first converted into purealuminium oxide by the Bayer Process, and this is then electrolysed in solution in molten cryolite - another aluminiumcompound. The aluminium oxide has too high a melting point to electrolyse on its own. The usual aluminium ore is bauxite.