Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound ?

Which of the following elements is extracted commercially by the elect

1.	Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound ?
Answer» Cl Br Al Na Solution :ALUMINIUM can be extracted by ELECTROLYSIS PURE alumina `(Al_2O_3)`. Alumina ionises as `Al_2O_3 HARR underset"cathode"(Al^(3+)) + underset"anode"(Al_3^(3-))` `Al^(3+) + 3e TOAL` (at cathode) `4AlO_3^(3-) to 2Al_2O_3 + 3O_2 + 12e` (at anode) Aluminium of 99.8% purity is obtained fromthis process.