Post-UTME Chemistry 2017 Objective — Question 17

Question 17 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2017 Objective paper, with the correct answer and a full explanation.

In the extraction of iron, limestone is fed into the furnace to provide

A. carbon (IV) oxide which reacts with hot coke
B. carbon (II) oxide which reduces iron (III) oxide
C. both carbon (IV) and carbon (II) oxides for reduction processes in the furnace
D. calcium oxide which reacts with silicon (IV) oxideCorrect

Explanation

Limestone decomposes in the furnace to form calcium oxide, which reacts with silica impurities to form slag, removing them from the molten iron.

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