Metallurgy: Bayer's and Hall's Methods for Aluminium Extraction

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12 Questions

What is the purpose of passing carbon dioxide gas through the warmed filtrate?

To precipitate aluminium hydroxide

What happens when Al(OH)3 is calcined at 1000°C?

It decomposes into Al2O3 and H2O

Which compound is added to the mixture during the electrolytic reduction of alumina to lower its melting point?

Cryolite (Na3AlF6)

What is deposited on the cathode during the electrolytic reduction of alumina?

Aluminium

What role does graphite lining play in the steel tank during electrolysis?

It acts as the cathode

Why do the anodes need to be changed periodically during the electrolysis of alumina?

Due to oxidation

What are the impurities present in bauxite?

Silica, ferric oxide, titanium oxide

Which method is used for the separation of impurities in bauxite?

Bayer's method

What is the final product obtained after the concentrated alumina is calcined?

Aluminium oxide

Which reagent is used to leach bauxite in Bayer's method?

Concentrated solution of caustic soda (NaOH)

What happens to aluminium hydroxide in the Hall's process?

It forms water-soluble sodium aluminate

What is the role of sodium carbonate in Hall's process?

To leach bauxite and form water-soluble sodium aluminate

Learn about the extraction of aluminium from bauxite ore using Bayer's and Hall's methods, including the separation of impurities through a leaching process and obtaining concentrated alumina through calcination. This quiz covers the metallurgy process discussed in Class 10 Science Notes for Maharashtra Board students.

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