Electrolysis of alumina: Extraction of aluminium

What is the primary source of aluminium for extraction?

• Bauxite

• Sand

• Hematite

• Limestone

What is the first step in the extraction of aluminium?

• Purification of Bauxite

• Electrolysis

• Refining

• Smelting

Which process is used to extract aluminium from purified bauxite?

• Electrolysis

• Distillation

• Filtration

• Sublimation

What is the main compound found in bauxite?

• Silicon dioxide

• Aluminium oxide

• Iron oxide

• Calcium carbonate

Which of the following is not a product of electrolysis in aluminium extraction?

• Sodium hydroxide

• Hydrogen

• Oxygen

• Aluminium

What is the role of cryolite in the electrolysis of aluminium oxide?

• Increases the electrical conductivity

• Acts as a catalyst

• Decreases the melting point

• Increases the melting point

At which electrode is aluminium formed during electrolysis?

• Anode

• Cathode

• Electrolyte

• None of the above

What is the primary environmental concern associated with aluminium extraction?

• Deforestation

• Air pollution

• Water pollution

• Soil erosion

Which of the following materials is not used in the electrolysis cell for aluminium extraction?

• Graphite

• Copper

• Aluminium oxide

• Cryolite

What is the chemical formula for Bauxite?

• Al2O3

• Fe2O3

• SiO2

• Al2O3.2H2O