The main reactions that occur in the blast furnace during iron extraction from hematite are:
| a. | Fe2O3 + 3CO → 2Fe + 3CO2 |
| b. | FeO + SiO2 → FeSiO3 |
| c. | Fe2O3 + 3C \(\xrightarrow[]{}\) 2Fe + 3CO |
| d. | CaO + SiO2 \(\xrightarrow[]{}\) CaSiO3 |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and d
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