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Chemistry · Oct / Nov 2020 · Paper 11 · Question 31

5070Extraction of metals

Iron is extracted from haematite in a blast furnace. Coke and limestone are added to the blast furnace. What is the function of the limestone?

  1. AIt decomposes and neutralises acidic impurities.
  2. BIt is a fuel which heats the furnace.
  3. CIt oxidises the iron in haematite.
  4. DIt releases oxygen allowing the coke to burn.

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Correct answer: A. It decomposes and neutralises acidic impurities.

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