Extraction of Aluminium Quiz

Which gases are all present at the positive electrode during the manufacture of aluminium?

• CO, H2, CO2

• CO, SO2, H2O

• O2, CO, CO2

• SO2, H2, O2

An alloy of aluminium is used in the construction of aircraft. Why is pure aluminium never used?

• Pure aluminium cannot be manufactured.

• Pure aluminium conducts electricity.

• Pure aluminium is less dense than its alloys.

• Pure aluminium is too malleable.

The diagram shows apparatus that can be used to extract aluminium. What are J, K and L?

• negative electrode, aluminium oxide, + cryolit

• aluminium, negative electrode, cryolite

• positive electrode, aluminium oxide, cryolite

• positive electrode, aluminium oxide, + cryolit

In the electrolysis of molten aluminium oxide for the extraction of aluminium, the following three reactions take place. Which reactions take place at the positive electrode?

• 1 only

• 2 only

• 1 and 3 only

• 2 and 3 only

Aluminium is manufactured by the electrolysis of molten aluminium oxide. Which gas is not formed during this process?

• carbon dioxide

• carbon monoxide

• oxygen

• sulfur dioxide

Which gases are formed during the production of aluminium by electrolysis of molten aluminium oxide?

• carbon dioxide, carbon monoxide, oxygen

• carbon dioxide, carbon monoxide, sulfur dioxide

• carbon dioxide, oxygen, sulfur dioxide

• carbon monoxide, oxygen, sulfur dioxide

Which statement about the material used for aircraft bodies is correct? Aircraft bodies are made from

• an aluminium alloy because pure aluminium is too soft.

• pure aluminium because of its high melting point.

• pure aluminium because of its low density.

• pure aluminium because of its resistance to corrosion.

In the electrolysis of aluminium oxide to extract pure aluminium a compound called cryolite is first added to the oxide. What is the reason for adding the cryolite?

• to reduce the corrosion of the carbon electrodes by oxygen

• to reduce energy costs

• to enable the aluminium ions and oxygen ions to move to the electrodes

• to prevent the aluminium formed from being oxidised back to aluminium oxide

The diagram shows the electrolytic production of aluminium. What are the products at the electrodes?

• solid aluminium, hydrogen

• solid aluminium, oxygen

• liquid aluminium, hydrogen

• liquid aluminium, oxygen

Aluminium is used to make saucepans because of its apparent lack of reactivity. Which property of aluminium explains its unreactivity?

• It has a high electrical conductivity.

• It has a low density.

• It has a surface layer of oxide.

• It is in Group III of the Periodic Table.