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 + ½ O2

Engineering

Chemistry

Extraction of Iron and Copper

Question

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

(a)

(d)

(a) and (d)

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In blast furnace, iron extraction involves reduction of iron oxides by CO and formation of slag. Reaction (a) occurs: CaO (basic) reacts with SiO₂ (acidic) to form slag CaSiO₃. Reaction (b) occurs: Fe₂O₃ is reduced stepwise by CO. Reaction (c) does NOT occur because FeO is basic and does not react with acidic SiO₂; CaO is used instead. Reaction (d) does NOT occur because FeO is reduced by CO, not by thermal decomposition.

Thus, reactions (c) and (d) do not occur.

Final answer: (c) and (d)