EXTRACTION OF METALS
EXTRACTION OF METALS
Total Questions: 60
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1. An Alloy is...
Mixture of different metals
2. Noble metals are metals that...
Do not combine with natural elements
3. One of these is not a noble metal
Sn
4. A mineral is the same as an ore.
False
5. Earthy impurities found in ores are termed...
Gangue
6. One of these methods cannot be used to extract a metal from its ore.
Froth Floatation
7. One of these methods cannot be used to concentrate an ore.
Crushing
8. Froth Floatation is used mostly in which of the following types of ores?
Sulphide ore
9. One of these metals is not compulsorily extracted using electrolysis
Zinc
10. Copper can displace sodium in NaCl solution.
False
11. Water gas is usually used as a reducing agent during the extraction of which of these metals?
Nickel
12. _ uses electricity to split elements of a compound.
Electrometallurgy
13. During electrolysis, pure metals are collected in which electrode?
Cathode
14. The heating of a metal ore to convert it to its oxide in the absence of air is termed...
Calcination
15. The Heating of a metal ore to convert it to its oxide form in the presence of air is termed...
Roasting
16. Burning an ore in the presence of flux and reducing agent is termed...
Smelting
17. One of these is not used as a reducing agent during Pyrometallurgy
Silica
18. Which of these reducing agents can be used to extract chromium from Cr2O3
Aluminium
19. Which of these reducing agents is used to extract manganese from Mn3O4
Aluminium
20. Which of these reducing agents can be used for the extraction of titanium from titanium chloride
Magnesium
21. Which of the following is the correct formula of water gas?
H2 + CO
22. The roasting of Nickel sulphide in air will give...
Nickel oxide
23. One of these sulphide ores does not exhibit self reduction
NiS
24. Self reduction will occur if an ore is subjected to continuous, non-stop heating in the presence of enough air
False
25. _ is any substance that is used to maintain fluidity and remove impurities during smelting
Flux
26. Acidic flux will not remove one of these impurities.
CaSO4
27. One of these cannot be employed as a basic flux
CaSO4
28. One of these is not a refining process
Magnetic sorting
29. Easily Fused metals are refined by...
Liquation
30. The most common ore from which sodium is extracted is...
NaCl
31. Sodium is extracted by
Electrometallurgy
32. The electrolytic cell model that is used for the extraction of sodium from sodium chloride is...
Down's cell
33. CaCl2 is added to NaCl before electrolysis. Why?
To lower the melting point of sodium chloride
34. Sodium _ electrons and then it is deposited on the _ of an electrolytic cell during electrolysis of sodium chloride
Gains, cathode
35. Which of the following equation of reaction correctly depicts what happens in the cathode during electrolysis of sodium chloride
Na+ + e- → Na
36. A steel gauze is used to surround the graphite anode during electrolysis of sodium chloride. What would be the effect if the steel gauze was absent
Sodium and chlorine would react violently together to reform sodium chloride
37. Which of these extraction methods is the most exothermic?
Pyrometallurgy
38. Lithium is extracted by
Electrometallurgy
39. Magnesium is extracted using Pyrometallurgy
False
40. Aluminium is extracted by
Electrometallurgy
41. Molten cryolite is added to purified bauxite before electrolysis. Why?
To lower the melting point of Al2O3
42. One of these is not an ore of iron
Dolomite
43. Iron is extracted by...
Reduction by burning
44. _ is regularly used as a flux during the smelting of iron
CaCO3
45. Slag – an impurity of iron is used for all these but one
Purification of copper
46. What is the role of limestone during the smelting of iron?
Flux
47. In what part of the blast furnace does reduction of iron oxide take place?
Upper part
48. Impure iron that is obtained from the reduction of iron oxide is...
Pig iron
49. Which of these is the purest form of iron?
Wrought iron
50. Lead is extracted by Electrometallurgy
False
51. The most common ore of lead is...
Galena
52. The most common ore of zinc is...
Sphalerite (Zinc Blende)
53. The most common ore of aluminium is
Bauxite
54. Copper that is obtained at the end of reduction is purified by
Electrolysis
55. Titanium is extracted from rutile by
Kroll and Hunter process
56. Why is carbon not used as a reducing agent during extraction of titanium?
Titanium has affinity for carbon
57. _ is an example of metal oxide that is not reduced to metallic state with carbon
Mn3O4
58. Which of these is the cheapest and most abundant reducing agent employed in the extraction of metals
Carbon
59. Which of these methods is used for the refining of metals that are easily fused?
Liquation
60. Reducing agents separate a metal from constituents in its ore by...
Taking away the non-metallic constituent
