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.
Cryolite is added to remove impurities.
D.
Carbon dioxide is produced at the anode.
Exam No：0620_m20_qp_22 Year：2020 Question No：27
Answer:
D
Knowledge points:
9.6.5.1. the role of cryolite
9.6.5.2. why the carbon anodes need to be regularly replaced
9.6.5.3. the reactions at the electrodes, including ionic half-equations
Solution:
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