Aluminium is extracted from bauxite by electrolysis. Which statement is correct?
A.
Aluminium ions are oxidised to form aluminium.
B.
The cathode has to be replaced regularly because it reacts with the oxygen which is formed.
C.
Carbon dioxide is produced at the anode.
D.
Cryolite is added to remove impurities.
Exam No：0620_m24_qp_22 Year：2024 Question No：30
Answer:
C
Knowledge points:
9.5.1. State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide
9.5.2. State some common barrier methods, including painting, greasing and coating with plastic
9.5.3. Describe how barrier methods prevent rusting by excluding oxygen or water
9.5.4. Describe the use of zinc in galvanising as an example of a barrier method and sacrificial protection
9.5.5. Explain sacrificial protection in terms of the reactivity series and in terms of electron loss
Solution:
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