General principles and processes of isolation of metals MCQs-1

1) Grain alcohol is
a) CH3 OH
b) C2H5OH
c) (CH3 )2 CHOH
d) (CH)3)3 C.OH

2) In qualitative analysis metal ions are separated on the basis of their
a) atomic size
b) ionic size
c) oxidation number
d) solubility characteristics

3) H2S is used in qualitative analysis of metal ions to
a) identify
b) classify
c) separate
d) all the above

4) Siderite is a
a) Carbonate of iron
b) Sulphate of iron
c) Nitrate of iron
d) Oxideore of iron

5) An anion which forms soluble salts with all metal ions is
a) CI
b) SO42-
c) NO3
d) PO43-

6) During smelting of copper pyrites the reducing agent which reduces Cu2O is
a) FeO
b) Cu2 S
c) CuS
d) CuO

7) A green mineral is sparingly soluble in water. It dissolves in dil. HCI with effervescence. The gas evolved turns lime water milky. The acid solution gives a black precipitate with H2S. With NH4OH a blue precipitate is formed whic
a) carbonate of nickel
b) sulphide of nickel
c) carbonate of copper
d) sulphide of copper

8) The reducing agent which reduces AI2O3 is
a) coke
b) CO
c) Zinc
d) electrons

9) The removal of impurities from a mineral by forming a molten salt is called
a) slagging
b) levigation
c) leaching
d) electrorefining

10) Galena on roasting gives
a) PbS + SO2
b) PbSO4
c) both a and b
d) Pb3O4 + SO2

11) Gold can be recovered from potassium dicyano aurate (I) by
a) complexing
b) oxidation
c) reduction
d) smelting

12) The four elements which are commercially extracted from sea water are
a) CI2,Br2, I2 and Na
b) CI2, Br2, Na and Mg
c) I2, Na, P and S
d) CI2,I2, Na and Mg

13) The oxidation number of Nickel in Nickel Carbonyl is
a) 0
b) 1
c) 2
d) 3

14) Carborundum is
a) WC
b) CaC2
c) SiC
d) SiC2

15) The reagent used in the leaching of silver ore is
a) 0.5% solution of Na CN
b) 5% solution of Na CN
c) 50% solution of NaCN
d) 10M solution of NaCN

16) A halide of silver which is soluble in water is
a) AgF
b) AgCI
c) AgBr
d) AgI

17) Trauna is a mineral used for the large scale manufacture of
a) CaCI2
b) Na2CO3
c) MgSO4
d) Boron

18) The specific gravity of slag is
a) Always higher than that of the molten metal
b) Always less than that of the molten metal
c) Same as that of the molten metal
d) None

19) The following equation represents a method of purification of Ni by

Ni + 4CO Ni(CO)4 Ni + 4CO

a) Cupellation
b) Mond’s process
c) Van Arkel
d) Zone refining

20) Which furnace can be used to get temperatures above 3000oC ?
a) Blast furnace
b) Muffle furnace
c) Reverberatory furnace
d) Arc furnace

21) Which substance is used as a basic refractory

material in a furnace ?

d) CaO

22) To obtain chromium from chromic oxide(Cr2O3), the method used is
a) Carbon reduction
b) CO reduction
c) Alumino thermic process
d) Electrolytic reduction

23) Froth floatation method may be used to increase the concentration of mineral in
a) Chalcopyrite
b) Bauxite
c) Haematite
d) Calamine

24) Blanc fixe is
a) Barium chloride
b) BaO
d) None

25) The main function of roasting is.
a) To remove the volatile matter
b) Oxidation
c) Reduction
d) To make slag

26) Calcination of an ore means
a) Strong heating in the presence of air
b) Strong heating in the absence of air
c) Strong heating only to melt the ore
d) Strong heating in a reducing-oxidising atmosphere

27) When limestone is heated, CO2 is given off. This operation in metallurgy is known as
a) Smelting
b) Ore dressing
c) Calcination
d) Roasting

28) The electrolytic method of reduction is employed for the preparation of metals that
a) Are weakly electropositive
b) Are moderately electropositive
c) Are strongly electropositive
d) From oxides

29) Refractory materials are used for the construction of furnaces because they
a) Are light in weight
b) Can withstand high temperatures
c) Are leak proof
d) Do not require to be replaced

30) Which is not a mineral ?
a) Mica
b) Peat
c) Quartz
d) Feldspar

31) The ore not concentrated by electromagnetic separation is
a) Wolframite
b) Haematite
c) Casseterite
d) None of the above. All can be concentrated magnetically

32) Thomas slag is
a) Calcium silicate
b) Calcium phosphate
c) Tricalcium phosphate and calcium silicate
d) Calcium ammonium phosphate

33) Which of these is a metalloid ?
a) Na
b) Au
c) As
d) Fe

34) Electrolysis of fused carnallite gives
a) Mg
b) K

35) After partial roasting, the sulphide of copper is reduced by
a) the cyanide process
b) Electrolysis
c) Reduction with carbon
d) Self reduction

36) Indian saltpetre is
a) KCl
c) NaCl

37) The main constituents of steel in India are (only the metals other than Fe);
a) Ni and Mg
b) V and CO
c) Al and Zn
d) Mn and Cr

38) The cryolite is

39) In the aluminothermic process, the thermite mixture contains

40) The metal used in storage batteries is
a) Cu
b) Sn
c) Pb
d) Ni

41) In the Hoopes process of aluminium extraction, the fused materials remain in three

different layers. These layers remain separated even in electrolytic reduction, because

a) The upper layer is attracted by the cathode and the lower layer is attracted by the anode
b) the cell is so arranged so as to separate the layers
c) All the layers have different densities
d) All the layers are at different temperatures

42) Ferric oxide in the blast furnace is reduced using
a) C
c) CO

43) The following are some of the methods commonly employed for the extraction of metals from their ores. Which of the following methods is generally employed for the extraction of sodium ?
a) Reduction of an oxide with coke
b) Electrolysis of an aqueous solution of a chloride
c) Electrolysis of a molten chloride
d) Reduction of a chloride with more reactive metal

44) The process of converting hydrated alumina into anhydrous alumina is called
a) Roasting
b) Smelting
c) Dressing
d) Calcination

45) Heating an ore in the absence of air below its melting point is called
a) Leaching
b) Roasting
c) Smelting
d) Calcination

46) In the commercial electrochemical process for aluminium extraction the electrolyte used is.

47) In the extraction of copper the reaction which takes place in the Bessemer converter is

48) Which one of the following is an ore of aluminium ?
a) Bauxite
b) Polomite
c) Galena
d) Feldspar

49) A permanent magnet is made from
a) Cast iron
b) Steel
c) Wrought ion
d) All of these

50) Which of the following substances consists of only one element ?
a) Marble
b) Sand
c) Graphite
d) Glass

51) Which of the following metals is sometimes found in the native state in nature ?
a) Al
b) Cu
c) Fe
d) Mg

52) Which of the following metals is present in bronze, brass and German silver ?
a) Zn
b) Mg
c) Cu
d) Al

53) In the equation 4M + 8CN + 2H2O + O2 4[M(CN)2]+ 4OH, identify the metal M.
a) Cu
b) Fe
c) Au
d) Zn

54) By reacting with which of the following will Cu2S give blister copper ?
a) FeO
b) CuO

55) To dissolve argentite which of the following is used ?
b) NaCN
c) NaCl
d) HCl

56) In the metallurgical operation of Al which of the following is electrolysed ?
a) Bauxite only
b) Cryolite only
c) Alumina only
d) Both (b) and (c)

57) Which of the following is not an ore of iron ?
a) Siderite
b) Magnetite
c) Dolomite
d) Haematite

58) Without losing its concentration , ZnCl2 solution can not be kept in contact with
a) Al
b) Au
c) Pb
d) Ag

59) Which of the following elements constitute a major impurity in pig iron ?
a) Silicon
b) Oxygen
c) Sulphur
d) Carbon

60) German silver is an alloy of
a) Cu, Zn, Ni
b) Cu, Zn, Sn
c) Ag, Cu, Au
d) Fe, Cr, Ni

61) The metal extracted with the cyanide process is
a) Ag
b) Cu
c) Fe
d) Na

62) The important oxide ore of iron is
a) Sidherite
b) Haematite
c) Pyrites
d) Bauxite

63) The most abundant metal on the surface of the earth is
a) Fe
b) Al
c) Ca
d) Hg

64) Malachite is an ore of
a) Fe
b) Zn
c) Cu
d) Hg

65) Which metal is extracted by electrolytic reduction ?
a) Fe
b) Cu
c) Ag
d) Al

66) During smelting an additional substance is added which combines with impurities to form a

fusible product called slag. The substance added is known as

a) Slag
b) Mud
c) Gangue
d) Flux

67) Which one of the following is not an ore of copper ?
a) Limonite
b) Malachite
c) Chalcopyrite
d) None

68) Casseterite is an ore of
a) Pb
b) Cu
c) Sn
d) Fe

69) Electrolytic refining is used for refining
a) Pb
b) Cu
c) Fe
d) Na

70) Cryolite is used in the extraction of
a) Al
b) Pb
c) Fe
d) Cu

71) Pb is extracted from :
a) Malachite
b) Haematite
c) Galena
d) Magnetite

72) The alumino thermic process is used for the metallurgy of
a) Pb
b) Ag
c) Al
d) None

73) An example of an oxide ore is
a) Bauxite
b) Malachite
c) zinc blende
d) Feldspar

74) In order to refine blister copper it is melted in a furnace and is stirred with green logs of wood. The purpose is:
a) To expel the dissolved gases in blister copper
b) To bring the impurities to surface and oxidise them
c) To increase the carbon content of copper
d) To reduce the metallic oxide impurities

75) Iron when treated with conc. HNO3
a) Readily reacts
b) Slowly reacts
c) Becomes passive
d) Gives ferrous nitrate

76) Which of the following ores is a chloride ?
a) Horn silver
b) Zincite
c) Bauxite
d) Feldspar

77) Of the following substances the one which does not contain oxygen is
a) Bauxite
b) Epsom salt
c) Cryolite
d) Dolomite

78) The froth floatation process is used for the metallurgy of
a) Oxide ores
b) Chloride ores
c) Sulphide ores
d) Amalgams

79) The metal present in blood is
a) Al
b) Mg
c) Cu
d) Fe

80) The metal that causes tin cry is
a) Fe
b) Sn
c) Ni
d) Sb

81) Aluminium is most abundant in earth crust, yet it is obtained from bauxite because
a) Bauxite is available in large quantity
b) It is easy to extract aluminium from it
c) Bauxite contains the maximum aluminium
d) Bauxite is less impure

82) Which are the constituents of gun metal ?
a) Cu, Sn
b) Cu, Sn, Zn, Pb
c) Cu, Zn, Sb, Pb
d) Cu, Sn, Pb

83) An ore like zinc blende is concentrated by
a) Froth floatation
b) Leaching
c) Magnetic separation
d) Washing with water

84) Which of the following is obtained as slag in the metallurgy of copper from copper pyrites?

85) If the impurity in a metal has a great affinity for oxygen and is more easily oxidised than the metal, then the purification of metal is carried out by
a) Poling
b) Zone refining
c) Electrolytic refining
d) Cupellation

86) Aluminium has a greater affinity for oxygen and its oxidation is an exothermic reaction.

This fact is made use of in

a) Preparing thin foils of Al
b) Preparing duralumin alloy
c) Making utensils
d) Thermite welding

87) The metallurgical operation in which metal is obtained in the fused state is called
a) Froth floatation
b) Calcination
c) Roasting
d) Smelting

88) Which one of the following metals is obtained by electrolytic reduction ?
a) Fe
b) Cu
c) Ag
d) Al

89) Of the following three (Ag,Mg, and Al) the metal that cannot be obtained by electrolysis of the aqueous solution of their salts is
a) Ag alone
b) Mg alone
c) Al alone
d) both (b) and (c)

90) Which one of the following processes is used for the mineral Al2O.2H2O ?
a) Froth floatation
b) Leaching
c) Liquation
d) Magnetic separation

91) Which process of purification is represented by the following equation ?

Ti + 2I2 Ti I4 Ti + 2I2

a) Cupellation
b) Poling
c) Van Arkel
d) Zone refining

92) Ina metallurgical process the flux used for removing acidic impurities is
a) Silica
b) Sodium chloride
c) Limestone
d) Sodium carbonate

93) The cupellation process is used in the metallurgy of
a) Cu
b) Zn
c) Ag
d) Al

94) An ore of tin containing FeCrO4 is concentrated by
a) Magnetic separation
b) Froth floatation
c) Electrostatic method
d) Gravity separation

95) The zone refining process is used for
a) Concentration of an ore
b) Reduction of a metal oxide
c) Purification of metal
d) Purification of an ore

96) Which of the following statements is correct regarding the slag obtained during the extraction of metal like copper or iron?
a) The slag is lighter and has a lower melting point than the metal
b) The slag is heavier and has a lower melting point than the metal
c) The slag is lighter and has a higher melting point than the metal
d) The slag is heavier and has a higher melting point than the metal

97) An ore after levigation is found to have basic impurities. Which of the following can be used as a flux ?

98) The substance which is added to an ore in order to remove impurities during melting is called the
a) Slag
b) Flux
c) Gangue
d) Catalyst

99) In metallurgy flux is a substance used to convert
a) Infusible impurities to fusible
b) Mineral into silicate
c) Fusible impurities to infusible material
d) Soluble particles to insoluble impurities

100) Which of the following metals is extracted by a reduction process ?
a) Cu
b) Al
c) Fe
d) Mg



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