The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
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Fe2O3 (s) + 3CO (g) → 2 Fe (l) +3CO2 (g)
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CaCO3 (s) → CaO (s) + CO2 (g)
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CaO (s) +SiO2 → CaSiO3 (s)
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2C (s) + O2 (g) → 2 CO(g)
