WAEC Chemistry 2013 Objective — Question 45

Question 45 of 50 from the West African Examinations Council (WAEC) Chemistry 2013 Objective paper, with the correct answer and a full explanation.

The main function of limestone in the blast furnace is to

A. act as catalyst
B. act as reducing agent
C. remove impurityCorrect
D. supply carbon (IV) oxide

Explanation

The main function of limestone in the blast furnace is to remove impurity. The limestone decomposes to give calcium oxide, CaO. The calcium oxide then reacts with silica impurities to form calcium trioxosilicate (IV), known as slag. CaCO3 →(Δ) CaO+CO2; CaO+SiO2 → CaSiO3 (slag).

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