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Question
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
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Solution
Oxygen gas is produced during the extraction of aluminium. This oxygen gas is produced at anode. During electrolysis, aluminium atoms are deposited at cathode, whereas oxide ions, being anions, get attracted to positively charged anode. These oxide ions are oxidised to oxygen gas. Oxygen gas is produced at anode.
Anode:
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