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Among the reactions (a)-(d), the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are: (a) CaO + SiO2 → CaSiO3 (b) 3Fe2O3 + CO → 2Fe3O4 + CO2 (c) FeO + SiO2 → FeSiO3 (d) FeO → Fe + 1/2 O2

1. (c) and (d)
2. (a)
3. (a) and (d)
4. (d)

Correct answer: (c) and (d)

Solution

Added limestone gives CaO, which combines with SiO2 to form slag (reaction a occurs), so FeO + SiO2 -> FeSiO3 (c) does not take place. Direct decomposition FeO -> Fe + 1/2 O2 (d) also does not occur. Hence (c) and (d) are the reactions that do not occur.

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