Aluminium Extraction Quiz

What is the most abundant metal on earth?

• Gold

• Iron

• Aluminium

• Copper

What is the function of cryolite in the extraction of aluminium?

• To decrease the density of aluminium oxide

• To increase the melting point of aluminium oxide

• To increase the density of aluminium oxide

• To decrease the melting point of aluminium oxide

What material is used for the negative cathode in the extraction of aluminium?

• Copper

• Aluminium

• Iron

• Graphite

What is the byproduct formed at the positive anode during aluminium extraction?

• Carbon monoxide

• Carbon dioxide

• Nitrogen gas

• Oxygen gas

What is the overall reaction for the extraction of aluminium?

• Aluminium oxide --> aluminium + hydrogen

• Aluminium oxide--> aluminium + oxygen

• Aluminium oxide --> aluminium + carbon dioxide

• Aluminium oxide --> aluminium + nitrogen

What happens at the negative cathode during aluminium extraction?

• Aluminium ions lose electrons

• Oxygen ions gain electrons

• Aluminium ions gain electrons

• Oxygen ions lose electrons

What happens at the positive anode during aluminium extraction?

• Oxygen ions gain electrons

• Aluminium ions lose electrons

• Oxygen ions lose electrons

• Aluminium ions gain electrons

Why is aluminium extraction considered very expensive?

• High transportation costs

• High electricity usage

• High raw material costs

• High labor costs

What is the main reason for the gradual wearing away of the positive anode during aluminium extraction?

• Reaction with aluminium ions

• Reaction with oxygen ions

• Reaction with nitrogen ions

• Reaction with hydrogen ions