WAEC Chemistry 2014 Theory — Question 30
Question 30 of 38 from the West African Examinations Council (WAEC) Chemistry 2014 Theory paper, with the correct answer and a full explanation.
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4(a)(iii). Explain briefly why extraction of aluminium is considered environmentally friendly while that of sodium is not.
Model answer
The anodic product during the electrolytic extraction of aluminium is oxygen, which does not constitute any harm to the surrounding environment. However, the anodic product from the extraction of sodium is chlorine gas, which is a dangerous, poisonous air pollutant.
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