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JAMB Chemistry 1978 Question 24

Question 24

Metals and their Compounds

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

  1. A.CaCO3(s) → CaO(s) + CO2(g)
  2. B.C(s) + O2(g) → CO2(g)
  3. C.3Fe(s) + 2O2(g) → Fe3O4(s)
  4. D.SiO2(s) + CaO(s) → CaSiO3(s)
  5. E.CO2(g) + C(s) → 2CO(g).
Show the answer and explanation

Answer: C (3Fe(s) + 2O2(g) → Fe3O4(s))

Explanation

The blast furnace reduces iron ore to iron; iron is not oxidised there. Limestone decomposes, coke burns to CO2, CO2 is reduced to CO, and CaO removes silica as slag (CaSiO3).