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In a blast furnace, which of the following reactions take place in the temperature interval 500–800 K? (i) Fe2O3 + CO → 2FeO + CO2 (ii) Fe3O4 + 4CO → 3Fe + 4CO2 (iii) FeO + CO → Fe + CO2 (iv) C + CO2 → 2CO

1. (i) and (ii)
2. (i), (ii) and (iii)
3. (iii) and (iv)
4. (iv) only

Correct answer: (i), (ii) and (iii)

Solution

In the lower-temperature (500-800 K) upper zone, CO reduces the iron oxides: Fe2O3 -> FeO, Fe3O4 -> Fe and FeO -> Fe, i.e. reactions (i), (ii) and (iii). Reaction (iv) C + CO2 -> 2CO (coke gasification) occurs only at higher temperature (900-1500 K).

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