WAEC Chemistry 2024 Objective — Question 43
Question 43 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.
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43. The main function of limestone in the blast furnace during the extraction of iron is to
- A. act as a catalyst
- B. remove impuritiesCorrect
- C. act as a reducing agent
- D. supply carbon (V) oxide
Explanation
Limestone decomposes to CaO, which reacts with silica impurities to form slag (CaSiO₃), removing them from the molten iron.
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