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Chemistry · May / June 2020 · Paper 12 · Question 28

5070Extraction of metals

Which equation shows a thermal decomposition that occurs in the blast furnace?

  1. AC + O2 → CO2
  2. BCO2 + C → 2CO
  3. CCaCO3 → CaO + CO2
  4. DCaO + SiO2 → CaSiO3

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Correct answer: C. CaCO3 → CaO + CO2

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