Level 1 — Basic Recall (1–10)

1. What is corrosion?

2. What is rust?

3. Name the essential conditions for rusting of iron.

4. Define galvanizing.

5. What is meant by “sacrificial protection”?

6. Give one example of a protective coating on metals.

7. What is an anode in corrosion?

8. What is a cathode in corrosion?

9. Name one metal more reactive than iron used in sacrificial protection.

10. Define “oxidation” in terms of electron transfer.

Level 2 — Understanding (11–20)

11. Explain how water accelerates rusting.

12. Why does salt water increase corrosion rate?

13. Why is rust porous and flaky?

14. Explain how electrochemical corrosion occurs on iron surfaces.

15. How does oxygen concentration difference cause differential aeration corrosion?

16. Why does coating with paint prevent corrosion?

17. Why does zinc protect iron better than tin plating?

18. Describe how stainless steel resists corrosion.

19. Why does galvanizing continue to protect even if scratched?

20. Distinguish between uniform and localized corrosion.

Level 3 — Application (21–30)

21. Predict which part of an iron structure exposed to air and water will corrode faster.

22. Explain why joining copper and iron together accelerates iron corrosion.

23. Suggest a metal suitable for sacrificial protection of steel pipelines.

24. Describe how cathodic protection is used on ships.

25. Compare corrosion in acidic vs alkaline environments.

26. Predict corrosion risk when iron is buried in moist soil.

27. Explain why aluminium forms a protective oxide layer but iron does not.

28. Describe how coatings like oil or grease prevent rusting.

29. Suggest corrosion prevention methods for steel bridges.

30. Explain the role of inhibitors in corrosion prevention.

Level 4 — Analysis (31–40)

31. Analyse the electrochemical reactions in rust formation.

32. Compare galvanic corrosion and environmental corrosion.

33. Evaluate the effects of impurities on corrosion rate.

34. Analyse why welded joints corrode more quickly.

35. Discuss the role of pH in corrosion rate.

36. Compare anodic and cathodic regions on a corroding iron surface.

37. Examine why corrosion is faster in tropical climates.

38. Evaluate the use of alloys vs coatings for corrosion protection.

39. Analyse the chemistry behind protective oxide films.

40. Compare sacrificial anode and impressed-current cathodic protection systems.

Level 5 — Exam/Challenge (41–50)

41. Write balanced half-equations for rusting in neutral aerated water.

42. Suggest a complete corrosion control plan for an offshore oil platform.

43. Analyse the thermodynamic driving force behind corrosion using electrochemical series.

44. Predict corrosion behaviour of a multi-metal system (Fe, Zn, Cu) in seawater.

45. Evaluate long-term effectiveness of galvanizing vs epoxy coating on steel structures.

46. Explain stress-corrosion cracking and its industrial impact.

47. Compare corrosion in freshwater, seawater, and industrial effluents.

48. Propose methods to monitor corrosion rates in pipelines (electrochemical probes, coupons).

49. Analyse environmental and economic impacts of corrosion in large industries.

50. Design a corrosion-resistant system for a water storage tank using material choice + protection methods.