WAEC Chemistry 2021 Theory — Question 25
Question 25 of 31 from the West African Examinations Council (WAEC) Chemistry 2021 Theory paper, with the correct answer and a full explanation.
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4(c). Describe briefly the extraction of tin from its ore.
Model answer
The ore is concentrated by crushing and washing with water, then roasted in air to remove impurities. The concentrated ore is mixed with charcoal/carbon (coke) and heated (smelted) to reduce the tin(IV) oxide to molten tin: SnO2(s) + 2C(s) → Sn(l) + 2CO(g). The impure tin obtained is then refined to obtain pure tin.
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