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The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag: Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g) CaCO₃(s) → CaO(s) + CO₂(g) CaO(s) + SiO₂(s) → CaSiO₃(s) 2C(s) + O₂(g) → 2CO(g)

1. Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g)
2. CaCO₃(s) → CaO(s) + CO₂(g)
3. CaO(s) + SiO₂(s) → CaSiO₃(s)
4. 2C(s) + O₂(g) → 2CO(g)

Correct answer: CaO(s) + SiO₂(s) → CaSiO₃(s)

Solution

The reaction CaO(s) + SiO₂(s) → CaSiO₃(s) represents the formation of slag, where calcium silicate (CaSiO₃) is formed as a byproduct in the blast furnace.

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