WAEC Chemistry 2010 Objective — Question 47

Question 47 of 49 from the West African Examinations Council (WAEC) Chemistry 2010 Objective paper, with the correct answer and a full explanation.

The main function of limestone in the blast furnace is to

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

Explanation

The main role of limestone in the blast furnace is to remove impurities. It first decomposes thermally to give quicklime, CaO. Quicklime then combines with earthy impurities (SiO2) to give calcium trioxosilicate (IV), CaSiO3 (slag).

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