Metallurgy MCQs

1. Which of the following is used as a depressant in the froth floatation process?

(a) NaCN

(b) NaCl

(c) NaOH

(d) Na₂CO₃

2. In the extraction of aluminium, alumina is dissolved in:

(a) Lime water

(b) Molten cryolite

(c) Conc. HCl

(d) Bauxite

3. The chief ore of Zinc is:

(a) Calamine

(b) Zincite

(c) Sphalerite

(d) Cinnabar

4. Which of the following methods is used for concentration of sulphide ores?

(a) Magnetic separation

(b) Froth floatation

(c) Leaching

(d) Liquation

5. Which flux is used to remove acidic impurities in metallurgy?

(a) SiO₂

(b) CaCO₃

(c) B₂O₃

(d) NaCl

6. The reducing agent in aluminothermic process is:

(a) C

(b) CO

(c) Al

(d) H₂

7. Zone refining is used for:

(a) Iron

(b) Zinc

(c) Silicon

(d) Copper

8. In the electrolytic refining of copper, pure copper is obtained at:

(a) Anode

(b) Cathode

(c) Electrolyte

(d) None of these

9. Which one is an ore of Tin?

(a) Cassiterite

(b) Galena

(c) Bauxite

(d) Malachite

10. Which of the following is an ore of aluminium?

(a) Cryolite

(b) Cassiterite

(c) Malachite

(d) Galena

11. Haematite is concentrated by:

(a) Froth floatation

(b) Magnetic separation

(c) Leaching

(d) Distillation

12. Bauxite is purified using:

(a) Cyanide process

(b) Baeyer's process

(c) Froth floatation

(d) Parke's process

13. In the electrolytic refining of copper, which of the following acts as the electrolyte?

(a) Cu(NO₃)₂

(b) Acidified CuSO₄

(c) NaCl

(d) HNO₃

14. Which process is used to obtain extremely pure metals?

(a) Roasting

(b) Zone refining

(c) Smelting

(d) Liquation

15. The ore malachite is:

(a) CuFeS₂

(b) CuCO₃·Cu(OH)₂

(c) Cu₂S

(d) CuO

16. Which of the following is not a method of concentration of ore?

(a) Leaching

(b) Roasting

(c) Hydraulic washing

(d) Magnetic separation

17. The role of cryolite in the extraction of aluminium is:

(a) Acts as catalyst

(b) Makes electrolyte conducting

(c) Lowers melting point of alumina

(d) None

18. Cupellation is used for refining of:

(a) Iron

(b) Zinc

(c) Silver

(d) Aluminium

19. The flux added to remove acidic impurities is:

(a) SiO₂

(b) NaCl

(c) CaCO₃

(d) B₂O₃

20. Silver is extracted by:

(a) Bayer's process

(b) Hall-Heroult process

(c) Cyanide process

(d) Thermite process

21. Which metal is refined by the Van Arkel process?

(a) Ti

(b) Al

(c) Fe

(d) Na

22. Which of the following is not correctly matched?

(a) Cassiterite – Sn

(b) Argentite – Ag

(c) Bauxite – Zn

(d) Galena – Pb

23. Calcination involves:

(a) Heating in excess air

(b) Heating in absence/limited air

(c) Melting of ore

(d) Reaction with acid

24. Roasting is used to convert:

(a) Sulphide ores to oxides

(b) Oxides to sulphides

(c) Carbonates to oxides

(d) Chlorides to oxides

25. The roasting of ZnS gives:

(a) ZnCO₃

(b) Zn

(c) ZnO

(d) Zn(OH)₂

26. Which of the following is not true for calcination?

(a) Removes moisture

(b) Removes volatile impurities

(c) Converts sulphide ores to oxide

(d) Removes CO₂ from carbonates

27. The process used for FeCO₃ before reduction is:

(a) Roasting

(b) Leaching

(c) Calcination

(d) Refining

28. In calcination, hydrated ores:

(a) Gain water

(b) Lose water

(c) React with oxygen

(d) Form metal directly

29. Which of the following ore is roasted before reduction?

(a) FeCO₃

(b) ZnS

(c) Al₂O₃

(d) MnO₂

30. What is released during roasting of sulphide ore?

(a) NO₂

(b) NH₃

(c) SO₂

(d) CO

31. Which of the following is used for converting carbonates into oxides?

(a) Roasting

(b) Leaching

(c) Calcination

(d) Distillation

Answer Key

1. (a) 2. (b) 3. (c) 4. (b) 5. (b)
6. (c) 7. (c) 8. (b) 9. (a) 10. (a)
11. (b) 12. (b) 13. (b) 14. (b) 15. (b)
16. (b) 17. (c) 18. (c) 19. (c) 20. (c)
21. (a) 22. (c) 23. (b) 24. (a) 25. (c)
26. (c) 27. (c) 28. (b) 29. (b) 30. (c)
31. (c)