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Which of the following reactions occurs during smelting in the reduction zone (in iron metallurgy) ? 

(A) CaO + SiO2 → CaSiO3 (slag) 

(B) Fe2O3 + 3C → 2Fe + CO 

(C) Fe2O3 + CO → Fe + CO 

(D) CO2 + C → 2CO

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(C) Fe2O3 + CO → Fe + CO

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