JAMB Chemistry 2021 Objective — Question 40

Question 40 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

The main function of limestone in the blast furnace is to

A. Melt the ore
B. Act as a catalyst
C. Act as reducing agent
D. Remove impurityCorrect

Explanation

Limestone (CaCO₃) decomposes to CaO in the blast furnace: CaCO₃ → CaO + CO₂. CaO then reacts with silica impurities (SiO₂) to form slag (CaSiO₃), removing impurities.

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