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The main reactions occurring in blast furnace during extraction of iron from haematite are ________.

(i) Fe2O3 + 3CO → 2Fe + 3CO2

(ii) FeO + SiO2 → FeSiO3

(iii) Fe2O3 + 3C → 2Fe + 3CO

(iv) CaO + SiO2 → CaSiO3

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(i), (iv)

(i) Fe2O3 + 3CO → 2Fe + 3CO 

(iv) CaO + SiO2 → CaSiO3

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