EduNinja

CAIE IGCSE Chemistry Iron Extraction Reactions

CAIE IGCSE Chemistry Iron Extraction Reactions
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise sequencing and balancing blast-furnace equations for coke combustion, carbon monoxide formation, hematite reduction and slag production.

How this is tested

  • write coke combustion and carbon dioxide reduction equations that produce heat and carbon monoxide
  • balance the reduction of iron(III) oxide by carbon monoxide to iron and carbon dioxide
  • write limestone decomposition and calcium silicate formation to explain impurity removal

Question 26

[Maximum number: 1]

Which equation represents the reduction of a compound found in hematite in the blast furnace?

A

2Al2O3→4Al+3O22 \mathrm{Al}_{2} \mathrm{O}_{3} \rightarrow 4 \mathrm{Al}+3 \mathrm{O}_{2}

B

CaO+SiO2→CaSiO3\mathrm{CaO}+\mathrm{SiO}_{2} \rightarrow \mathrm{CaSiO}_{3}

C

2FeO+CO→Fe2O3+C2 \mathrm{FeO}+\mathrm{CO} \rightarrow \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{C}

D

Fe2O3+3CO→2Fe+3CO2\mathrm{Fe}_{2} \mathrm{O}_{3}+3 \mathrm{CO} \rightarrow 2 \mathrm{Fe}+3 \mathrm{CO}_{2}