Same chapter3 marksDifficulty: Medium
Name the process by which aluminium oxide is obtained pure from bauxite, and write the equations for the two main steps.
Metallurgy
3 marksDifficulty: Medium
Name the chief ore of aluminium and state the process used to purify it.
Original Khojo Papers practice question — not from a past board paper.
Answer
The chief ore is bauxite, Al2O3·2H2O. It is purified by Baeyer's process, in which the powdered ore is treated with hot concentrated sodium hydroxide solution so that the amphoteric alumina dissolves as sodium aluminate while the impurities are filtered off.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Pure alumina is then recovered and used in the electrolytic extraction.
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