Geochemistry – MCQs

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1. The most abundant element in the Earth’s crust is:



 

2. The study of distribution and abundance of chemical elements in Earth is called:



 

3. Which element is the major component of the Earth’s core?



 

4. The percentage of oxygen in Earth’s crust is approximately:



 

5. Which gas was absent in the Earth’s early atmosphere?



 

6. Which of the following is a major greenhouse gas?



 

7. Which isotope of carbon is commonly used in radiocarbon dating?



 

8. The branch of geochemistry that studies isotopes is called:



 

9. The gold-silver-copper group belongs to which geochemical classification?



 

10. Which element is most abundant in the whole Earth (crust + mantle + core)?



 

11. The pH of pure water at 25°C is:



 

12. Elements that prefer to bond with sulfur are known as:



 

13. Which element is essential in chlorophyll?



 

14. The study of chemical changes in rocks during weathering is part of:



 

15. Which radioactive isotope is used for dating very old rocks?



 

16. Which process concentrates valuable minerals in magma chambers?



 

17. The average salinity of seawater is:



 

18. The dominant gas in Earth’s atmosphere is:



 

19. Which element is considered a trace element in geochemistry?



 

20. The geochemical cycle that involves carbon is called:



 

21. The term “partition coefficient” in geochemistry refers to:



 

22. Which element is responsible for acid mine drainage?



 

23. The most abundant dissolved ion in seawater is:



 

24. The branch of geochemistry dealing with organic compounds is called:



 

25. The chemical formula of quartz is:



 

26. The process by which magma evolves chemically is called:



 

27. The major element in basalt is:



 

28. Which radioactive element is commonly used in nuclear power?



 

29. The outermost layer of Earth where weathering occurs is:



 

30. Which element is most abundant in granite?



 

31. The oxidation of sulfide minerals often produces:



 

32. Which element is a major component of the atmosphere but not of the crust?



 

33. The hydrosphere contains the largest amount of which element?



 

34. Which isotope of uranium is used in dating rocks?



 

35. Which process releases carbon dioxide into the atmosphere?



 

36. The primary gas released by volcanic eruptions is:



 

37. The chemical weathering of feldspar produces:



 

38. Which element is commonly enriched in coal?



 

39. The boundary between mantle and core is rich in:



 

40. Which of the following is a greenhouse gas?



 

41. The chemical composition of halite is:



 

42. Which isotopic ratio is used to study paleoclimate?



 

43. The element most abundant in the mantle is:



 

44. Which chemical is used for neutralizing acidic soils?



 

45. Which is NOT a major rock-forming element?



 

46. The study of chemical processes in sediments is called:



 

47. Which cycle describes the movement of sulfur in the environment?



 

48. The lithophile elements are concentrated in:



 

49. The isotopic method used for groundwater dating is based on:



 

50. Which major element is found in both mantle and crust?



 

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