O Levels Chemistry (5070)•5070/12/O/N/22
Explanation
Blast Furnace Iron Extraction Process Steps:
- Charge furnace with haematite (Fe₂O₃), coke, and limestone (CaCO₃).
- Coke reacts with oxygen to form CO₂, then CO.
- CO reduces Fe₂O₃ to Fe; CaCO₃ forms slag with impurities.
- Evaluate each option against known reactions.
The question has two correct statements, A and B.
Why A is correct:
- CaCO₃ decomposes to CaO + CO₂; CaO reacts with acidic impurities like SiO₂ per CaO + SiO₂ → CaSiO₃ (slag), removing them from molten iron.
Why the others are wrong:
- B: This is also correct (Fe₂O₃ + 3CO → 2Fe + 3CO₂ defines the reduction step).
- C: Haematite undergoes reduction, not oxidation; CO₂ is a product, not an oxidizing agent.
- D: Haematite is chemically reduced by CO, not thermally decomposed.
Final answer: A and B
Topic: Extraction of metals
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