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Chemistry · May / June 2025 · Paper 11 · Question 28

5070Extraction of metals

Iron is extracted from its ore hematite in a blast furnace. Which statement about this extraction process is correct?

  1. AAir is blown into the blast furnace to react with carbon.
  2. BAt the bottom of the blast furnace, a layer of molten iron floats on top of a layer of molten slag.
  3. CLimestone is decomposed in the blast furnace to produce carbon monoxide.
  4. DSilicon dioxide, an impurity in the ore, is a basic oxide.

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Correct answer: A. Air is blown into the blast furnace to react with carbon.

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