Chemistry · Oct / Nov 2019 · Paper 11 · Question 29
Aluminium is extracted from aluminium oxide by electrolysis. [diagram of electrolysis cell] Which statement about this electrolysis is correct?
- AAluminium ions gain electrons to form aluminium.
- BCryolite increases the melting point of the electrolyte.
- CCryolite reacts with impurities to form slag.
- DThe carbon cathode has to be replaced regularly as it reacts with oxygen.
As printed in the paper
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Correct answer: A. Aluminium ions gain electrons to form aluminium.
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