(a) Which metal is extracted from bauxite ore? (b) Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula. (c) Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved. (d) Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken. Name a common metal which is highly resistant to corrosion.
ChemistryClass 10ICSEAnswered 27 Mar 2026
Answer
- Haematite; Iron (III) oxide, Fe2O3
- Zinc sulphide (zinc blende ore) is strongly heated in air (roasted), it forms zinc oxide and sulphur dioxide. This process is called roasting.
2Zn(s) + 3O2(g) → 2ZnO(s) + 2SO2
Zinc oxide is heated with carbon to form zinc metal. This is reduction. ZnO(s) + C(s) → 2ZnO(s) + 2SO2(g)
- Zinc is more easily oxidized than iron thus the zinc continues to corrode but iron objects does not rust