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Questions and Answers
What is the purpose of passing carbon dioxide gas through the warmed filtrate?
What is the purpose of passing carbon dioxide gas through the warmed filtrate?
- To dissolve alumina
- To precipitate aluminium hydroxide (correct)
- To enhance the conductivity of the solution
- To increase the pH of the solution
What happens when Al(OH)3 is calcined at 1000°C?
What happens when Al(OH)3 is calcined at 1000°C?
- It forms Al(OH)2
- It melts into a liquid
- It sublimates into a gas
- It decomposes into Al2O3 and H2O (correct)
Which compound is added to the mixture during the electrolytic reduction of alumina to lower its melting point?
Which compound is added to the mixture during the electrolytic reduction of alumina to lower its melting point?
- Calcium carbonate (CaCO3)
- Sulphuric acid (H2SO4)
- Cryolite (Na3AlF6) (correct)
- Sodium chloride (NaCl)
What is deposited on the cathode during the electrolytic reduction of alumina?
What is deposited on the cathode during the electrolytic reduction of alumina?
What role does graphite lining play in the steel tank during electrolysis?
What role does graphite lining play in the steel tank during electrolysis?
Why do the anodes need to be changed periodically during the electrolysis of alumina?
Why do the anodes need to be changed periodically during the electrolysis of alumina?
What are the impurities present in bauxite?
What are the impurities present in bauxite?
Which method is used for the separation of impurities in bauxite?
Which method is used for the separation of impurities in bauxite?
What is the final product obtained after the concentrated alumina is calcined?
What is the final product obtained after the concentrated alumina is calcined?
Which reagent is used to leach bauxite in Bayer's method?
Which reagent is used to leach bauxite in Bayer's method?
What happens to aluminium hydroxide in the Hall's process?
What happens to aluminium hydroxide in the Hall's process?
What is the role of sodium carbonate in Hall's process?
What is the role of sodium carbonate in Hall's process?
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