Level 1 — Basic Recall (1–10)

1. What is air pollution?

2. Name one primary air pollutant.

3. What gas causes acid rain?

4. What is the main greenhouse gas released by human activity?

5. Name one pollutant removed in water treatment.

6. What is eutrophication?

7. What is the ozone layer?

8. Name one particulate pollutant.

9. What is meant by “biodegradable”?

10. What is the main source of carbon monoxide?

Level 2 — Understanding (11–20)

11. Explain how SO₂ contributes to acid rain.

12. Why do CFCs damage the ozone layer?

13. Describe how photochemical smog forms.

14. Explain biomagnification with an example.

15. Why is CO dangerous to humans?

16. Describe how NOₓ gases are produced in vehicles.

17. Explain why fertilizers cause eutrophication.

18. What is BOD (Biochemical Oxygen Demand)?

19. Describe the greenhouse effect.

20. Explain why leaded petrol was banned.

Level 3 — Application (21–30)

21. Predict the impact of excess nitrate ions on aquatic ecosystems.

22. Suggest a method to remove SO₂ from factory emissions.

23. Explain how catalytic converters reduce vehicle pollution.

24. Predict how increasing CO₂ affects ocean pH.

25. Describe how activated sludge treats wastewater.

26. Classify pollutants as primary or secondary.

27. Suggest methods to reduce methane emissions.

28. Explain how heavy metals enter food chains.

29. Predict effects of oil spills on marine life.

30. Suggest ways to reduce solid waste generation.

Level 4 — Analysis (31–40)

31. Compare greenhouse gases by global warming potential.

32. Analyse the effect of pH on metal solubility in soil.

33. Explain why ozone depletion increases UV-B radiation.

34. Compare municipal vs industrial wastewater contaminants.

35. Discuss ecological consequences of deforestation.

36. Analyse the role of renewable energy in reducing emissions.

37. Evaluate the effectiveness of bag filters, scrubbers, and electrostatic precipitators.

38. Explain how microplastics impact marine life and food safety.

39. Compare natural vs anthropogenic sources of greenhouse gases.

40. Analyse how environmental regulations influence industrial chemistry practices.

Level 5 — Exam/Challenge (41–50)

41. Using chemical equations, show how acid rain forms from SO₂ and NOₓ.

42. Propose a multi-step treatment process for highly contaminated industrial wastewater.

43. Evaluate the scientific basis and consequences of global warming.

44. Predict long-term ecosystem changes due to eutrophication using trophic-level analysis.

45. Explain the free radical mechanism of ozone depletion by CFCs.

46. Compare different carbon capture and storage (CCS) technologies.

47. Discuss advanced oxidation processes (AOPs) in degrading toxic pollutants.

48. Evaluate the impacts of heavy metals like Hg, Pb, Cd on biochemical pathways.

49. Propose a sustainable waste management plan for a growing urban city.

50. Analyse how environmental chemistry principles contribute to green chemistry and circular economy strategies.