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Chemistry · May / June 2025 · Paper 12 · Question 28

5070Extraction of metals

The iron(III) oxide used in a blast furnace contains the impurity silicon(IV) oxide, SiO2. Which reaction removes the silicon(IV) oxide?

  1. A3SiO2 + Fe2O3 → 2Fe + 3SiO3
  2. BSiO2 + C → Si + CO2
  3. CSiO2 + CaO → CaSiO3
  4. D2SiO2 + N2 → 2Si + 2NO2

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Correct answer: C. SiO2 + CaO → CaSiO3

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