Question

The method used for refining of aluminium is ______.

Options

• Hoope’s electrolytic process

• Hall’s process

• Bayer’s process

• Serpeck’s process

Answer 1

The method used for refining of aluminium is Hoope’s electrolytic process.

Explanation:

Hoopes process is an electrorefining method used to purify aluminium to a very high grade, reaching up to 99.99% purity. It uses a three-layer electrolytic cell: dense, impure aluminium forms the bottom anode layer, a molten fluoride salt blend forms the middle electrolyte layer, and pure aluminium floats on top as the cathode. In contrast, the other three methods listed (Bayer's, Hall’s, and Serpeck’s processes) are extraction and concentration techniques used to obtain aluminium oxide (alumina) directly from raw bauxite ore, rather than refining the metallic element itself.