Metallurgy and Extraction of Metals - Question Bank
1. The Dow process is used for the extraction of which metal from seawater?
2. Which term describes the process of removing a metal from its ore in an aqueous solution?
3. Which of the following is an example of a pyrometallurgical process?
4. What is the main purpose of using carbon monoxide as a reducing agent in the blast furnace?
5. Which method is employed for the extraction of tin from stannic oxide (SnO₂)?
6. The Bessemer process, though primarily for steel making, involves the removal of impurities from molten pig iron. Which of the following is NOT typically removed in a Bessemer converter?
7. The extraction of zinc from zinc blende (ZnS) typically involves roasting followed by:
8. Which of the following metals is extracted by electrolysis of its fused salt?
9. What is the primary use of the thermite reaction in metallurgy?
10. Thermite reaction is an example of:
11. Which of the following processes is used to convert a metal oxide into a metal by heating it with a more electropositive metal?
12. Smelting is a process of extraction that typically involves:
13. Which of the following is a reducing agent commonly used in smelting at high temperatures?
14. The term 'gangue' refers to:
15. Which of the following ores can be separated by magnetic separation?
16. What is the basic principle behind the magnetic separation of ores?
17. In the Van Arkel method, a metal reacts with iodine to form a volatile metal iodide. This iodide is then heated to decompose it into the pure metal and iodine. Which metal is commonly purified by this method?
18. The Van Arkel method is used for the purification of which group of metals?
19. In Mond's process, nickel reacts with carbon monoxide to form nickel carbonyl. What is the state of nickel carbonyl at room temperature?
20. Mond's process is used for the purification of which metal?
21. What is the term for the process where a metal is purified by converting it into a volatile compound and then decomposing it?
22. Which of the following metals is typically extracted by electrolysis of its molten chloride?
23. In the Parkes process, molten lead is treated with molten zinc. What happens to the impurity being removed?
24. The Parkes process is used for the removal of which impurity from lead?
25. Which metal is extracted using the Parkes process?
26. The process of separating a metal from its ore by dissolving it in a suitable solvent is called:
27. What is the material used for electrodes in the electrolytic cell for Aluminium extraction?
28. What is the role of cryolite (Na₃AlF₆) in the electrolytic extraction of Aluminium?
29. The extraction of Aluminium from bauxite is done by the:
30. What is the primary ore of Aluminium?
31. Which of the following metals can be extracted by leaching with a dilute cyanide solution followed by displacement with zinc?
32. Thermodynamic principles, like Ellingham diagrams, are useful in predicting:
33. The extraction of metals from their ores using a reducing agent is known as:
34. Which method is used for the purification of metals like silicon and germanium, which have very low impurity levels?
35. What is the 'anode mud' formed during the electrolytic refining of copper?
36. In electrolytic refining of copper, the impure copper is made the anode, and a thin strip of pure copper is made the cathode. What is used as the electrolyte?
37. What is the term for the process of removing impurities from an impure metal by electrolysis?
38. The slag formed during the smelting of iron from haematite is primarily:
39. Which of the following is a common flux used in the smelting of iron ore?
40. In the blast furnace, iron is extracted from haematite (Fe₂O₃). What acts as the reducing agent in the lower, hotter part of the furnace?
41. What is the main purpose of adding a flux during smelting?
42. During roasting of sulphide ores, the sulphide is converted into:
43. Roasting is typically carried out for which type of ores?
44. Which process involves heating the concentrated ore in the absence or limited supply of air below its melting point?
45. In the froth flotation process, the mineral particles attach to the air bubbles and rise to the surface, while the undesired impurities (gangue) sink. What substance is typically used to make the mineral particles hydrophobic?
46. Which of the following is NOT a common method for concentrating ores?
47. What is the term for the naturally occurring solid material from which a metal can be profitably extracted?
48. Which method is commonly used to extract highly reactive metals like Sodium and Potassium?
49. What is the primary objective of metallurgy?
50. Which of the following terms describes the process of separating a metal from its ore?