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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) and (ii)

Solution

Reactions (i) and (ii) involve the reduction of iron oxides, which can occur at the specified temperature range as carbon monoxide effectively reduces Fe2O3 to FeO and Fe3O4 to Fe. These reactions are thermodynamically favorable in a blast furnace environment, while the other reactions either require higher temperatures or do not fit the reduction context.

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