Post-UTME Chemistry 2015 Objective — Question 15
Question 15 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2015 Objective paper, with the correct answer and a full explanation.
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In the electrolytic extraction of aluminum from bauxite, carbon anodes are changed at intervals because they
- A. dissolve in the cryolite
- B. react with oxygen liberatedCorrect
- C. become inactive after some time
- D. lose their power to conduct electricity
Explanation
The carbon anodes are gradually burnt away as they react with the oxygen liberated during electrolysis, forming CO2, and must be replaced periodically.
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