1. The ores that are concentrated by flotation method are

(a) Carbonates

(b) Sulphides

(c) Oxides

(d) Phosphates

2. In blast furnace, iron oxide is reduced by

(a) Silica

(b) \(\mathrm{CO}\)

(c) \(\mathrm{C}\)

(d) Lime stone

3. Which of the following metal is obtained by leaching its ore with dilute cyanide solution

(a) Silver

(b) Titanium

(c) Vanadium

(d) Zinc

4. Van Arkel method of purification of metals involves converting the metal to a

(a) Volatile compound

(b) Volatile unstable compound

(c) Non-volatile stable compound

(d) Non-volatile unstable compound

5. Zone refining is a method to obtain

(a) Very high temperature

(b) Ultra pure AI

(c) Ultra pure Germanium

(d) Ultra pure oxides

6. Electrochemical process (electrolysis of fused salt) is used to extract

(a) Iron

(b) Lead

(c) Sodium

(d) Silver

7. In metallurgy, flux is a substance used to convert

(a) Mineral into silicate

(b) Fusible impurities to infusible impurities

(c) Infusible impurities to soluble impurities

(d) Soluble impurities into infusible impurities

8. \(\mathrm{Fe}_2 \mathrm{O}_3\) is reduced to spongy iron near the top of blast furnace by

(a) \(\mathrm{CO}\)

(b) \(\mathrm{CO}_2\)

(c) \(\mathrm{C}\)

(d) \(\mathrm{H}_2\)

9. Highest carhon content iron is

(a) Stainless steel

(b) Wrought iron

(c) Cast iron

(d) Mild iron

10. During smelting silica is added to roasted copper ore to remove

(a) Cuprous Sulphide

(b) Cuprous Oxide

(c) Ferrous oxide

(d) Ferrous sulphide

11. The ore which contains copper and iron both

(a) Malachite

(b) Chalcopyrite

(c) Chalcocite

(d) Azurite

12. In extraction of iron limestone is used for

(a) Formation of slag

(b) Reduction of Fe Ore

(c) Purification of Fe formed

(d) Oxidation of Fe Ore

13. The process of extracting the metal from its ore is called

(a) Refining

(b) Concentration

(c) Leaching

(d) Metallurgy

14. Roasting results in the production of metal in the case of

(a) iron pyrites

(b) galena

(c) cinnabar

(d) bauxite

15. The method for the purification of impure metals which is based upon the phenomenon of electrolysis is called

(a) Electrorefining

(b) Hydrometallurgy

(c) Poling

(d) Liquation

16. Van Arkel method is used for refining

(a) lead

(b) zirconium

(c) vanadium

(d) zinc

17. The metal always found in free state is

(a) Gold

(b) Silver

(c) Copper

(d) Sodium

18. In blast furnace, iron oxide is reduced by

(a) \(\mathrm{SiO}_2\)

(b) \(\mathrm{CO}\)

(c) dil. \(\mathrm{HCl}\)

(d) limestone

19. Parke's process is used in the extraction of

(a) \(\mathrm{Zn}\)

(b) Fe

(c) Ag

(d) \(\mathrm{Na}\)

20. In electrorefining, the impure the metal is made

(a) cathode

(b) anode

(c) may be cathode or anode

(d) none of these

21. The iron used in the froth flotation method for the purification of ores is

(a) Coconut oil

(b) Kerosene oil

(c) Mustard oil

(d) Pine oil

22. Roasting is generally done in case of

(a) Oxide ores

(b) Silicate ores

(c) Sulphide ores

(d) Carbonate ores

23. The following equation depicts a method of purification of nickel by \(\mathrm{Ni}+4 \mathrm{CO} \stackrel{320 \mathrm{~K}}{\longrightarrow} \mathrm{NI}(\mathrm{CO})_4 \stackrel{420 \mathrm{~K}}{\longrightarrow} \mathrm{NICO}_4\)

(a) Zone refining

(b) Mond's method

(c) Van Arkel method (d) Cupellation

24. In metallurgy, flux is a substance used to convert

(a) insoluble impurities to a fusible mass.

(b) minerals into silicates

(c) soluble particles into insoluble particles

(d) fusible impurities to infusible impurities.

25. Which of the following is generally found in free state?

(a) \(\mathrm{Cu}\)

(b) \(\mathrm{Al}\)

(c) \(\mathrm{Au}\)

(d) \(\mathrm{Fe}\)

26. In aluminothermic process aluminium acts as

(a) Oxidising agent

(b) reducing agent

(c) flux

(d) none of these

27. Which of the following ores cannot be concentrated by froth floatation process?

(a) Bauxite

(b) Cinnabar

(b) Galena

(d) Copper pyrite.

28. Gold is usually-found near the mineral:

(a) Galena

(b) Quartz

(c) Mica

(d) Dolomite

29. Hoop's process is used for the purification of

(a) \(\mathrm{Al}\)

(b) \(\mathrm{Pb}\)

(c) \(\mathrm{Ag}\)

(d) \(\mathrm{Zn}\)

30. Horn silver is :

(a) \(\mathrm{Ag}_2 \mathrm{~S}\)

(b) \(\mathrm{AgCl}\)

(c) \(\mathrm{Ag}_2 \mathrm{~S} \cdot \mathrm{Sb}_2 \mathrm{~S}_3\)

(d) Pure silver.

31. Which of the following is not an ore of aluminium?

(a) Feldspar

(b) Corundum

(c) Bauxite

(d) Carnallite.

32. Which of the following is not present in type metal?

(a) \(\mathrm{Pb}\)

(b) \(\mathrm{Cu}\)

(c) \(\mathrm{Sn}\)

(d) \(\mathrm{Sb}\)

33. Which of the following alloys does not contain copper?

(a) Delta metal

(b) German silver

(c) Alnico

(d) Phosphorus bronze

34. The metal essential for plant life is

(a) Zinc

(b) Iron

(c) Nitrogen

(d) Potassium.

35. In electrorefining of copper, pure copper is obtained

(a) at cathode

(b) at anode

(c) in the electrolyte

(d) in anode mud

36. The ore of copper is

(a) Malachite

(b) Apatite

(c) Dolomite

(d) Haematite.

37. Calcination is carried out in a

(a) Blast furnace

(b) Electric furnace

(c) Bessemer convertor

(d) Reverberatory furnace.

38. A metal obtained by hydrometallurgy is

(a) \(\mathrm{Ag}\)

(b) \(\mathrm{Fe}\)

(c) \(\mathrm{Na}\)

(d) \(\mathrm{Mg}\)

39. The mineral of magnesium is

(a) Bauxite

(b) Malachite

(c) Carnallite

(d) Haematite.

40. Iron is extracted from magnetite by reduction with

(a) \(\mathrm{C}\)

(b) \(\mathrm{Mg}\)

(c) \(\mathrm{AI}\)

(d) \(\mathrm{H}_2\)

41. Iron obtained from blast furnace is known as

(a) wrought iron

(b) cast iron

(c) pig iron

(d) steel

42. Copper is refined by

(a) Smelting

(b) Roasting

(c) Electrolytic method

(d) Heating in a blast furnace

43. Pyrargyrite is

(a) \(\mathrm{Ag}_2 \mathrm{~S}\)

(c) \(\mathrm{AgCl}\)

(d) \(\mathrm{Ag}_2 \mathrm{~S}\)

44. An example of halide ores is

(a) Galena

(b) Bauxite

(c) Cryolite

(d) Cinnabar,

45. Carbon reduction method is used in the extraction of

(a) \(\mathrm{Sn}\)

(d) \(7 \mathrm{n}\)

(c) \(\mathrm{Pb}\)

(d) All

46. High purity copper metal is obtained by

(a) Carbon reduction

(b) Hydrogen reduction

(c) Electrolytic reduction

(d) Thermite reduction

47. Silica is added to roasted copper ore during smelting in order to remove

(a) cuprous oxide

(b) cuprous sulphide

(c) ferrous sulphide

(d) ferrous oxide

48. Which of the following ore is best concentrated by froth flotation process?

(a) magnetite

(b) cassiterite

(c) galena

(d) malachite

49. During the process of electrolytic refining of copper some metals present as impurity settle as "anode mud". These are

(a) Sn and \(\mathrm{Ag}\)

(b) \(\mathrm{Pb}\) and \(\mathrm{Zn}\)

(c) \(\mathrm{Ag}\) and \(\mathrm{Au}\)

(d) \(\mathrm{Fe}\) and \(\mathrm{Ni}\)

50. Heating \(\mathrm{Cu}_2 \mathrm{O}\) and \(\mathrm{Cu}_2 \mathrm{~S}\) will give

(a) \(\mathrm{Cu}+\mathrm{SO}_2^2\)

(b) \(\mathrm{Cu}+\mathrm{SO}_3\)