Aluminium metal is purified by:

Options

A. Hoope electrolytic reduction process
B. Dow.s process
C. Serpeck.s process
D. Baeyer.s process

Answer

A

Explanation

The Hoope.s process is a process foe the electrolytle refining of aluminium. Impure Al forms the anode and pure Al forms the cathode of the Hooper.s cell which contains three liquid layers. The bottom layer is molten impure Al, the middle is a fused salt layer containing sodium fluoride, aluminum fluoride adn barium fluoride, and the top layer is pure Al. At the anode (bottom layer), Al posses with solution as aluminium ion `(Al^(3+))`, and at the cathode (top layer), these ions are reduced to the pure metal. In operation molten metal is added to the bottom of the cell and pure aluminium is drawn off the top
At anode: `Al rarr Al^(2+) + 3e`
At cathode: `Al^(3+) +3e^(-) rarr Al`