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In the blast furnace, the reaction that is taking place at the temperature zone of 900K to 1500K is

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FeO + CO → Fe + CO₂

Fe₂O₃ + CO → 2FeO + CO₂

Fe₃O₄ + CO → 3Fe + CO₂

All the above reactions

answer is A.

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Detailed Solution

After concentration, mixture of oxide ores of iron (Fe₂O₃,Fe₃O₄) is subjected to calcination/roasting to remove water, to decompose carbonates and to oxidise sulphides.
At 900 – 1500 K (higher temperature range in the blast furnace):

C+CO₂→2CO
FeO+CO→Fe+CO₂

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