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Chemistry · Oct / Nov 2019 · Paper 12 · Question 28

5070Extraction of metals

Iron is extracted from its ore in a blast furnace. Coke and limestone are also added to the blast furnace. What is the purpose of the limestone?

  1. Ato decompose to release oxygen to burn the coke
  2. Bto decompose to release oxygen to oxidise the iron
  3. Cto decompose to neutralise the acidic impurities
  4. Dto react with coke to heat the blast furnace

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Correct answer: C. to decompose to neutralise the acidic impurities

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