Multiple choice

In which of the following is reduction of metals using Al done?

  1. Bessemerisation

  2. Goldschmidt process

  3. Bayer's process

  4. Hall's process
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C Correct answer
Explanation

The process of producing pure alumina from bauxite is known as Bayer's process - extraction, precipitation and calcination. The aluminium-bearing minerals in bauxite are selectively extracted from the insoluble components (mostly oxides) by dissolving them in a solution of sodium hydroxide (caustic soda).

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