Extraction of Aluminium

The video explains the extraction of aluminium from its ore. Aluminium is found in bauxite, a metal ore with impurities like iron oxide. The Bayer process is used to remove these impurities, leaving alumina. Electrolysis is then employed to separate aluminium from alumina, requiring high temperatures and electricity. The process involves electrolytic cells where aluminium ions are attracted to a carbon cathode and oxide ions to a carbon anode, forming aluminium and oxygen gas. The final purification yields pure aluminium, a process used to produce millions of tons annually.

What is the primary ore from which aluminium is extracted?

• Hematite

• Bauxite

• Galena

• Chalcopyrite

What is the purpose of the Bayer process in aluminium extraction?

• To separate oxygen from aluminium

• To convert alumina into aluminium

• To remove impurities and obtain alumina

• To extract iron from bauxite

What happens to alumina when it is heated to 1200°C?

• It melts into a liquid

• It becomes a dry white powder

• It forms a solid metal

• It evaporates completely

In the electrolysis process, what is the role of the carbon cathode?

• To generate electricity

• To produce carbon dioxide

• To attract negative oxide ions

• To attract positive aluminium ions

What gas is produced at the anode during the electrolysis of aluminium oxide?

• Chlorine

• Nitrogen

• Oxygen

• Hydrogen