General principles and processes of isolation of metals MCQs-2

1) Silver metal is obtained by
a) Parke’s process
b) Froth floatation process
c) Carbon reduction process
d) Magnetic separation

2) Which of the following pair of elements cannot form an alloy ?
a) Zn, Hg
b) Fe, Hg
c) Fe, C
d) Hg, Na

3) When a metal is extracted from its ore which is associated to silica then
a) We need an acidic flux
b) We need a basic flux
c) We need both acidic and basic flux
d) None is required

4) Solder is
a) Cu + Zn
b) Cu + Sn
c) Pb + Sn
d) Pb + Sb

5) Iron ore is concentrated by
a) Froth flotation
b) Electrolysis
c) Roasting
d) Magnetic treatment

6) Barytes is
a) BaO
b) NaCl

7) Which process is used for the extraction of metals from their sulphide ores ?
a) Electrolysis
b) Metal displacement
c) Smelting
d) Roasting

8) Metals occur in their native state because of their
a) Low density
b) Low reactivity
c) High electronegativity
d) High reactivity

9) An alloy is an example of a
a) Gel
b) Aerosol
c) Solid sol
d) Emulsion

10) The flux used in the extraction of iron from haematite in the blast furnace is
a) Silica
b) Limestone
d) Calcium phosphate

11) In the floatation process for the benefication of minerals the particles float because
a) They are light
b) They are insoluble
c) Their surface cannot easily be wetted
d) They bear an electrostatic change

12) The impurities associated with minerals used in metallurgy are called collectively
a) Slag
b) Flux
c) Gangue
d) Ore

13) The process in which ore is heated in air below its melting point is known as
a) Roasting
b) Calcination
c) Reduction
d) Distillation

14) The reaction 2 ZnS + 3O2 2ZnO + 2SO2 in the metallurgical process of zinc is called
a) Calcination
b) Cupellation
c) Smelting
d) Roasting

15) The alumino thermic process is used for the extraction of metals, whose oxides are
a) Fusible
b) Not easily reduced by carbon
c) Not easily reduced by hydrogen
d) Strongly basic

16) In the manufacture of iron from an iron oxide ore, limestone is added because it acts as
a) An oxidising agent
b) A reducing agent
c) A flux
d) A precipitating agent

17) Heating pyrites in air to remove sulphur is known as
a) Calcination
b) Fluxing
c) Smelting
d) Roasting

18) A fusion mixture is

19) Which of the following processes involves the smelting process ?

20) Which of the following methods is not used in making steel ?
a) Duplex method
b) Bersem and Thomson
c) Open Hearth
d) Ostwald

21) Corrosion of iron can be prevented by coating the surface with (i) Zn; (ii) Sn; (iii) Ni
a) Only (i)
b) (i) or (ii)
c) (ii) or (iii)
d) Any one of (i), (ii) or (iii)

22) Corundum is

23) Froth floatation process for the concentration of ores is an illustration of the practical applications of
a) Adsorption
b) Absorption
c) Coagulation
d) Sedimentation

24) Bell metal used to make big bells is an alloy of
a) Cu, Al
b) Cu, Sn
c) Cu, Zn
d) Si, Ni

25) Steel contains
a) 2.5 – 4.5%C
b) 0.5 -1.5%C
c) 0.12 – 0.25% C
d) 1 – 2% C

26) High purity copper metal is obtained by
a) Carbon reduction
b) Hydrogen reduction
c) Electrolytic reduction
d) Thermit process

27) Dow metal is an alloy of
a) Mg + Zn
b) Mg + Al + Zn
c) Cu + Zn
d) Al + Zn

28) The composition of carnallite is
d) None

29) What is the process of nitriding used in the treatment of steel ?
a) Heating steel in an atmosphere of ammonia
b) Heating steel to a bright redness and then cool
c) Heating steel to bright redness and then cool by plunging in air
d) None

30) Rubies and sapphires contain

31) Bauxite ore is concentrated by
a) Froth flotation
b) Electromagnetic separation
c) Chemical separation
d) Hydraulic separation

32) Which of the following is not an alloy of aluminium ?
a) Al clad
b) Duralumin
c) Magnalium
d) All are alloys of aluminium

33) The substance used to remove impurities in the roasted or calcined ore is called
a) Gangue
b) Flux
c) Matrix
d) Slag

34) Roasting is used in refining
a) Galena alone
b) Copper pyrites alone
c) Copper glance alone
d) All three

35) A naturally occurring substance from which metal can be extracted profitably is called the
a) Mineral
b) Ore
c) Flux
d) Gangue

36) The purpose of smelting an ore is
a) To reduce it
b) To oxidise it
c) To obtain an alloy
d) To separate volatile impurities

37) In the metallurgical extraction of zinc from ZnO the reducing agent used is
a) Carbon monoxide
b) Sulphur dioxide
c) Carbon dioxide
d) Nitric oxide

38) Which of the following alloys contains Mg as one of the constituents?
a) Constantan
b) Electron
c) Brass
d) German silver

39) The carbon reduction method is used in the extraction of which of the following, Sn, Zn, Fe?
a) Sn only
b) Zn only
c) Fe only
d) All three

40) Chemical reduction is not suitable for converting
a) Bauxite into aluminium
b) Cuprite into copper
c) Haematite into iron
d) Zinc oxide into zinc

41) Monds process is used in the extraction of
a) Co
b) Ni
c) Mo
d) Zn

42) The process of ore dressing is carried out to
a) Remove the siliceous materials
b) Add flux to the mineral
c) Convert the ore to oxide
d) Remove the poisonous impurities

43) The formula of haematite is

44) The most durable metal plating on iron to protect against corrosion is
a) Nickel plating
b) Copper plating
c) Tin plating
d) Zinc plating

45) The volatile metal among the following is
a) Ag
b) Cu
c) Zn
d) Fe

46) An alloy is a
a) Mixture of two or more metals, not necessarily homogeneous
b) Solid solution of two or more metals or a metal and a non-metal
c) solid solution of two or more non-metals
d) None of these

47) Rusting of iron needs
a) Dry air
b) Air and water
c) Distilled water and carbon dioxide
d) Oxygen and carbon dioxide

48) Matte is the impure form of
a) Cu
b) Fe
c) Pb
d) Al

49) In electro-refining of copper some gold is deposited as
a) Anode mud
b) Cathode mud
c) Cathode
d) Electrode

50) Woods metal is an alloy of
a) Pb
b) Zn
c) Fe
d) Sn

51) Which of the following is obtained by hydro metallurgy: Cu, Au, Ag?
a) Cu alone
b) Au and Cu only
c) Ag and Au only
d) All three

52) When the metal is obtained in the molten states from its ore, the process may be called
a) Roasting
b) Smelting
c) Calcination
d) Thermal dissociation

53) Which metal shows inertness due to its protective layer?
a) Ag
b) Al
c) Fe
d) Au

54) Which of the following is malachite ore ?

55) Aluminium is obtained
a) By the reduction of alumina with carbon
c) By the electrolysis of pure alumina
d) By the electrolysis of pure alumina dissolved in molten cryolite

56) Blister copper is obtained by
a) Bessemerisation
b) Roasting
c) Poling .
d) Refining

57) The metallurgy of iron is the reduction of ferric oxide and is carried on in a
a) Blast furnace
b) Reverberatory furnace
c) Retort
d) Open-hearth furnace

58) Which of the following is obtained by the amalgamation process ?
a) Hg
b) Ag
c) Cd
d) Cu

59) Which metal can be prepared industrially by merely heating its ore in the presence of air ?
a) Iron
b) Mercury
c) Chromium
d) Calcium

60) Quenching of steel, which affects the strength of steel, implies
a) That steel is forged
b) That hot steel is cooled
c) That steel is heated
d) That steel is hammered

61) Which of the following metals is thrown as anode mud during the electrolytic refining of copper?
a) Zn
b) Fe
c) Ag
d) Ni

62) Which among Zinc blende, Zincite and Calamine, are ores of zinc?
a) Zinc blende and Zincite only
b) Zincite only
c) Calamine and zinc blende only
d) All three

63) A complex is involved in the extraction of
a) Na
b) Ag
c) Cu
d) Fe

64) Blister copper is
a) Pure copper
b) Ore of copper
c) Copper containing some impurity
d) Alloy of copper

65) Which of the following metals show magnetic properties ?
a) Manganese
b) Zinc
c) Nickel
d) Platinum

66) Which of the following is not a silver ore ?
a) Argentite
b) Siderite
c) Horn silver
d) Ruby silver

67) Baryta is
a) BaO

68) The purest form of iron is
a) Cast iron
b) Hard steel
c) Stainless steel
d) Wrought iron

69) Which of the following has the highest percentage of carbon ?
a) Stainless steel
b) Pig iron
c) Wrought iron
d) Mild steel

70) Invar steel contains
a) 3.5% Ni
b) 36% Ni
c) 2% Cr
d) 8%Ni, 18%Cr

71) Clock pendulums are made from
a) Brass
b) Invar
c) Solder
d) German silver

72) Magnetic separation is used for increasing the concentration of the following:
a) Sorn silver
b) Calcite
c) Haematite
d) Magnesite

73) Bronze is an alloy of
a) Cu and Sn
b) Cu, Zn, Ni
c) Cu, Zn, Sn
d) Cu, Zn

74) Duralumin contains.
a) 95% aluminium
b) 50% aluminium
c) 80% aluminium
d) None of these.

75) The processes of calcination and roasting are carried out in a
a) Blast furnace
b) Muffle furnace
c) Reverberatory furnace
d) Open hearth furnace

76) A mineral containing both magnesium and calcium is
a) Magnesite
b) Calcite
c) Carnallite
d) Dolomite

77) Amalgams are
a) Highly coloured alloys
b) Always in liquid state
c) Alloys which contain Hg as one of the constituents
d) Alloys which have a great resistance to abrassion

78) The element which exists in both very hard and very soft forms is
a) Tin
b) Sulphur
c) Phosphorus
d) Carbon

79) Which of the following does not form amalgam ?
a) Fe
b) Cu
c) Ag
d) Zn

80) Silver is a soft metal. It is hardened by alloying it with a small amount of
a) Fe and Al
b) Sn or Zn
c) Pt or Au
d) Cu or Ni

81) Which is the fusible alloy of cadium ?
a) Bell metal
b) Monel metal
c) Wood metal
d) Guina gold

82) Gold when dissolved in aqua regia gives
a) Auric chloride
b) Aurous chloride
c) Chloroauric acid
d) Aurous nitrate

83) In smelting, slag is obtained by the interaction of
a) Gangue and fuel
b) Gangue and flux
c) Gangue and furnace lining
d) Ore and flux

84) Smelting is done in a
a) Blast furnace
b) Muffle furnace
c) Open hearth furnace
d) Electric furnace

85) The inner layer of a blast furnace is made of
a) Graphite bricks
b) Fire clay bricks
c) Silica bricks
d) Basic bricks

86) Before introducing any FeO into a blast furnace, it is converted to Fe2O3 by roasting so that
a) It will not be removed as slag with silica
b) It may not evaporate in the furnace
c) its presence may increase the m.p. of the charge
d) None

87) Stainless steel does not rust because
a) Nickel present in it does not rust
b) Iron forms a hard chemical compound with chromium present in it
c) Chromium and nickel combine with iron
d) Chromium forms an oxide layer that protects iron from rusting

88) The smelting of iron in a blast furnace involves all the following steps except
a) Reduction
b) Fusion
c) Decomposition
d) Sublimation

89) The common method of extraction of metals from oxide ore involves
a) Reduction with carbon
b) Reduction with aluminium
d) Electrolytic reduction

90) The most malleable of all the metals is
a) Ag
b) Au
c) Na
d) Pt .

91) In the froth floatation process, which of the following is used as a froth,i.e., which helps in the formation of a stable froth?
a) Potassium xanthate
b) Pine oil
d) NaOH

92) Which is not correct in the case of copper ?
a) High heat conductivity
b) Low electrical conductivity
c) Tensile
d) Malleability

93) Which of the following is true ?
a) A mineral cannot be an ore
b) All minerals are ores
c) An ore can not be a mineral
d) All ores are minerals

94) In the electro refining of copper, the pure copper is found
a) At the cathode
b) At the anode
c) In the electrolyte
d) In the sludge

95) Cast iron is hard as well as brittle because it contains
a) > 2% C
b) > % C
c) 5% Pb
d) > 7.5 % C

96) Tin is an essential constituent of
a) German silver
b) Steel
c) Brass
d) Bronze

97) Permanent magnets are made of alloys of
a) Co
b) Zn
c) Al
d) Pb

98) Which of the following is manufactured by the electrolysis of fused NaCl ?
a) NaOH
b) NaCIO
d) Na

99) Gun metal is an alloy of
a) Cu and Sn
b) Cu, Zn and Ni
c) Cu, Zn , Sn and Pb
d) Cu and Al

100) If steel is heated to about 523 K and allowed to cool slowly, it retains its hardness but loses its brittleness. This process is called.
a) Quenching
b) Annealing
c) Nitriding
d) Hardening


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