(i) Fe2O3 + 3CO → 2Fe + 3CO2
(ii) FeO + SiO2 → FeSiO3
(iii) Fe2O3 + 3C → 2Fe + 3CO
(iv) CaO + SiO2 → CaSiO3
Correct Answers:
(i) Fe2O3 + 3CO → 2Fe + 3CO2
(iv) CaO + SiO2 → CaSiO3
Explanation: The main reactions that occur in the blast furnace during the extraction of iron from haematite are,
Fe2O3 + 3CO → 2Fe + 3CO2
CaO + SiO2 → CaSiO3