Question

The process of leaching, alumina using sodium carbonate is called _________.

• A. bayer's process
• B. decomposition
• C. cyanide process
• D. hall's process

Answer 1

The correct option is D hall's process

Bauxite is concentrated through Hall’s process, in which sodium aluminate is prepared using sodium carbonate in bauxite. When excess carbon dioxide is passed through sodium aluminate in the presence of water, it forms aluminium hydroxide along with sodium carbonate. When dried aluminium hydroxide is ignited, alumina is formed.