Assignment_ch8
01. Fe2O3 is a molecular formula of (A) Iron pyrites
(B) Magnetite
(C) Hematite
02. Formula of siderite is (A) FeCO3
(B) Fe3O4
(C) FeS2
(D) Siderite
(D) Fe2O3
03. Which one is a reducing agent from the following?
(A) CO
(B) None of these
(C) CO2
(D) H2O
04. Which is the correct molecular formula of sodium aluminate?
(A) NaAl2O3
(B) NaAlO3
(C) Na3AlO3
(D) NaAlO2
05. The melting point of iron (Fe) is (A) 1539° C
(B) 1500° C
(C) 1039° C
(D) 1739° C
06. The melting point of Tungsten (W) is (A) 3422° C
(B) 3400° C
(C) 4310° C
(D) 4330° C
07. Which is the correct formula of iron rust?
(A) Fe2O3
(B) Fe3O4 · 2 H2O
(C) Fe2O3 · xH2O
(D) Fe2O3 · 10H2O
08. What is the chemical formula of copper glance?
(A) Ag2S
(B) Cu2S
(C) CuCl2
(D) AgCl
09. Cryolite is added during electrolysis of Al2O3 because.........
(A) Pure aluminium is obtained.
(B) Aluminium can be obtained in solid
form.
(C) It decreases the melting point of Al2O3.
(D) Aluminium does
not react with graphite layer.
10. What is the molecular formula of red coloured rust?
(A) Fe2O3 . xH2O
(B) Fe2O3
(C) Fe(OH)2
(D) FeO
11. What is the chemical formula of dolomite?
(A) Fe3O4
(B) CuCO3
(C) CaCO3 . MgCO3
(D) None
12. What is the chemical formula of gypsum?
(A) CaSO4 . 3H2O
(B) None
(C) CaSO4 . 2H2O
(D) CaSO4 . H2O
13. What is the chemical formula of sodium aluminate?
(A) NaAlO2
(B) None
(C) NaAlO3
(D) NaAlO
14. Which gas is release during the reaction of metal with acid?
(A) NO2
(B) CO2
(C) H2
(D) SO2
15. Bismuth is refined by which method?
(A) Reduction
(B) Liquefaction
(C) Electrolysis
these
(D) None of
16. Blast furnace is useful for extraction of iron from ........
(A) Graphite
(B) Iron Pyrite
(C) Haematite
(D) Siderite
17. Blast furnace used for extraction of Fe from its ore is made specially
from...........
(A) Iron
(B) Graphite
(C) Heat resistant bricks
(D) Glass
18. By which method the sulphide ore concentrated?
(A) Calcination process
(B) Bayer’s process
(D) Magnetic separation
(C) Froth floatation
19. By which method, highly reactive metals are concentrated?
(A) Froth floatation
(B) Centrifugal method
(C) Chemical method
(D) Magnetic separation
20. During liquefaction method impurities remain on the sloping hearth of
the furnace because.
(A) impurities stick on the sloping hearth at liquefaction temperature.
(B) impurities are in gaseous state at liquefaction temperature.
(C)
impurities remain in liquid state as they melt at liquefaction
temperature.
(D) impurities remain in solid state as they do not
melt at liquefaction temperature.
21. How much percent pure metal is obtained by refining ?
(A) 90%
(B) 92%
(C) 100%
(D) Nearly 100%
22. In electrolytic refining the impurities deposited at the bottom of anode is
called ..........
(A) Anodic mud
(B) Slag
(C) Concentrated Ore
(D)
Electrolytes
23. In EMF series, the reactivity of metal from top to bottom is (A) Increase
(B) Remain constant
(C) Decrease
(D)
Become zero
24. In roasting,.........
(A) Sulphide ore gets converted to oxide
(B) Carbonate ore gets
converted to oxide
(C) Hydroxide ore gets converted to oxide
(D) Oxide ore gets converted to sulphide
25. In which form metals are present in lithosphere?
(A) Oxide or sulphide
(B) Bromide
(C) Nitride
(D) Chloride
26. In which order are the standard oxidation potential of metals arranged
in the EMF series?
(A) Descending order
(B) Irregular order
(C) Ascending order
(D) None of these
27. Metal reacts with acid and produced
(A) None
(B) Salt
(C) Nonmetal
(D) Base
28. Name the metal extracted from its ore in a blast funace.
(A) Aluminum
(B) Iron
(C) Copper
(D) Gold
29. Normally iron is obtained from (A) Malachite
(B) Hematite
(C) Cryolite
(D) Bauxite
30. Of which metal is gypsum the main ore?
(A) Co
(B) Ca
(C) Cd
(D) Cu
31. On adding lime powder to aqueous copper sulphate solution…..
(A) Blue colour of copper sulphate solution becomes dark
(B) No change
in intensity of colour
(C) Blue colour of copper sulphate solution becomes
light
(D) No chemical reaction occurs
32. Removal of electron during the reaction is called ..........
(A) None of these
(B) Reduction
(C) Electrolysis
Oxidation
(D)
33. The conversion of carbonate ores into oxide ores is called (A) Reduction
(B) Roasting
(C) Calcination
(D) Smelting
34. The conversion of sulphide ore into Oxide are is called (A) Calcination
(B) Smelting
(C) Roasting
(D) Froth
floatation
35. The correct reactivity series of Mg, K, Na & Cu is
(A) Na > K > Mg > Cu
(B) K > Na > Mg > Cu
(C) Mg > K > Na > Cu
(D) K > Mg > Cu > Na
36. The iron ore is concentrated by which process?
(A) Centrifugal
(B) Magnetic Seation
(C) Chemical method
(D) Froth flotation
37. The process of removal of very light particles from ore is called
(A) Filteration
(B) Centrifugal
(C) Roasting
(D) Calcination
38. The purity of alumina obtained by Bayer’s process is (A) 100%
(B) 90.50%
(C) 99%
(D) 99.50%
39. The semi-metals silicon and germanium is purified by which process?
(A) liquefaction
(B) Electrolysis
(C) Fractional refining
(D)
Zone refining
40. The stable form of compound of metals obtained from the earth and
from which metals can be obtained conveniently and economically on
commercial basis are known as ______.
(A) Ores
(B) Minerals
(C) Stable compounds
(D) None of
these
41. Ultrapure uranium is obtained by which method?
(A) Hall Haroult
(B) Van Arkel
(C) Electrolysis
(D) Bayer’s
42. What happened when powdered Zn is added to the aq Solution of
CuSo4?
(A) Blue solution become dark
(B) Blue colored solution turns colorless
(C) No change in color intensity
(D) No chemical reaction takes place
43. What is blast furnace, used for extraction of iron is made of?
(A) Glass
(B) Iron
(C) Graphite
(D) Fire resistant bricks
44. What is coated on iron to make galvanized iron?
(A) Silver
(B) Zinc
(C) Aluminum
(D) Gold
45. What is meant by gold?
(A) 20 carat
(B) None
(C) 22 carat
(D) 24 carat
46. What is percentage of pure metal obtained by refining?
(A) 90%
(B) 100%
(C) 92%
(D) nearly 100%
47. What is the colour of copper sulphate solution?
(A) Yellow
(B) Blue
(C) Red
(D) Green
48. What is the Iron-pillar made of?
(A) Interstitial compound
(B) None of these
Carbon
(C) Iron
(D)
49. What is the method of separating the metal from its mineral and
purifying it know as?
(A) Metallurgy
(B) Seation
(C) Roasting
(D) Purification
50. What is the state of mercury?
(A) Uncertain
(B) Solid
(C) Liquid
51. What is the true reactivity series?
(A) Mg > Al > Zn
(B) Al > Zn > Mg
Mg > Zn
(D) Gas
(C) Mg > Zn > Al
(D) Al >
52. Which alloy is formed by mixture of aluminum and magnesium?
(A) Steel
(B) Magnalium
(C) Stainless
(D) Brass
53. Which alloy is used making surgical instruments?
(A) Magnesium
(B) Steel
(C) Stainless steel
(D) Brass
54. Which alloy is used to make scientific balance?
(A) Manganese
(B) Magnesium
(C) Molybledylum
(D) Magnalium
55. Which alloy is used to prepare musical instruments?
(A) Stainless steel
(B) Brass
(C) Steel
(D) magnesium
56. Which cell is used to extract aluminium?
(A) Galvanic
(B) Hall Haroult
(C) Bayer’s
57. Which elements are present in Brass alloy?
(A) Copper & Zinc
(B) Iron & Carbon
(D) Aluminium & Magnesium
(D) Van Arkel
(C) Nickel & Chromium
58. Which elements are present in bronze?
(A) Copper and carbon
(B) Copper and nickel
(D) Copper and tin
(C) Copper and zinc
59. Which gas is produced when most of the metals react with acid?
(A) Nitrogen
(B) Chlorine
(C) Hydrogen
(D) Oxygen
60. Which impurity of about 1 ppm in Germanium stops chain reaction?
(A) Nickel
(B) Boron
(C) Copper
(D) Iron
61. Which impurity of about 1 ppm in Uranium stop nuclear fission
reaction?
(A) Copper
(B) Germanium
(C) Magnesium
(D) Boron
62. Which is alloy in the following?
(A) Gold ornaments
(B) Iron plate
Nickel plate
(C) Platinum wire
(D)
63. Which is the best conductor of heat and electricity?
(A) Iron
(B) mercury
(C) Silver
(D) Lead
64. Which is the principle of fractional refining process?
(A) Roasting
(B) Fractional crystallisation
(C) Fractional
distillation
(D) Fractional Separation
65. Which is the semi-conductor from following?
(A) Cu
(B) Al
(C) Fe
(D) Ge
66. Which metal blocks are attached to iron plates of steamer to prevent
corrosion?
(A) Manganese
(B) Iron
(C) Zinc
(D) Carbon
67. Which metal cannot be extracted by chemical reduction method?
(A) Aluminum
(B) Magnesium
(C) Sodium
(D) Iron
68. Which metal does not react with water?
(A) Magnesium
(B) Zinc
(C) Copper
(D) Iron
69. Which metal impurity of about 1 ppm in uranium hinders the process of
nuclear fission?
(A) Ni
(B) Fe
(C) B
(D) Cu
70. Which metal is a poor conductor of heat?
(A) Aluminium
(B) Silver
(C) Lead
(D) Copper
71. Which metal is coated to prevent iron rusting?
(A) Ag
(B) Zn
(C) Pt
(D) Cu
72. Which metal is electroplated on the surface of iron for preparing
galvanised iron?
(A) Copper
(B) Tin
(C) Zinc
(D) Magnesium
73. Which metal is mixed with gold to make gold ornaments?
(A) Nickel
(B) Copper or Silver
(C) Platinum
(D) Zinc
74. Which metal is obtained as anode mud during electrolysis process to get
copper metal?
(A) Manganese-Nickel
(B) Iron
(C) Graphite
(D) Gold-Silver
75. Which metal is obtained in highly pure form by Van Arkel method?
(A) Calcium
(B) Germanium
(C) Iron
(D) Magnesium
76. Which metal reacts vigorously with water?
(A) Magnesium
(B) Zinc
(C) Potassium
(D) Aluminium
77. Which method is used for concentration of ore?
(A) Calcination
(B) Centrifugation
(C) Roasting
Smelting
(D)
78. Which method is used for purification of more reactive metals?
(A) Reduction
(B) Roasting
(C) Electrochemical reduction
(D) Calcination
79. Which method is used to obtain pure alumina from bauxite?
(A) None of these
(B) Hall-Heroult’s method
(C) Solvay’s Method
(D) Bayer’s method
80. Which negative electrode (cathode) is used in electrolysis stage of
metallurgy?
(A) Pure metal rod
(B) Carbon rod
(C) Impure metal rod
Platinum rod
81. Which of the following is not a metal?
(A) Iron
(B) Gold
(C) Silver
(D) Carbon
(D)
82. Which of the following metal is in liquid state?
(A) Radium
(B) Potassium
(C) Galium
83. Which of the following metal is less reactive?
(A) Aluminum
(B) Copper
(C) Gold
(D) Magnesium
(D) Iron
84. Which of the following metal is not more reactive than magnesium?
(A) Sodium
(B) Iron
(C) Potassium
(D) Calcium
85. Which of the following options is correct according to the reactivity of
metals?
(A) Ca > Mg > Al > zn
(B) Zn < Al < Ca < Mg
(C) Mg < Ca < Al < Zn
(D) Zn > Al > Ca > Mg
86. Which of the following substance is not used in chemical reduction
method?
(A) Iron
(B) Carbon
(C) Aluminum
(D) Carbon-dioxide
87. Which of these metals do not react with water?
(A) All of these
(B) Silver
(C) Copper
(D) Lead
88. Which oil is used in froth floatation method?
(A) Castor oil
(B) Coconut oil
(C) Groundnut oil
Turpentine
89. Which one is a semi-metal?
(A) Ge
(B) Cu
(C) Fe
(D)
(D) Ni
90. Which one is more reactive metal?
(A) Lead
(B) Iron
(C) Sodium
91. Which one is used in a nuclear reactor?
(A) Boron
(B) Uranium
(C) Tin
(D) Copper
(D) Germanium
92. Which one of the following substance is not used in chemical reduction
method?
(A) Aluminium
(B) Carbon
(C) Carbon-dioxide
(D) Boxite
93. Which particles get wet by turpentine and stick to it in froth floatation
method?
(A) Dust ticles
(B) Metal sulphide
(C) Oxide ticles
(D) Sand
particles
94. Which reaction occur on cathode during electrolysis
(A) Oxidation
(B) Addition
(C) Reduction
(D) Redox
95. Which soft metal can be cut by knife?
(A) Aluminum
(B) Iron
(C) Magnesium
(D) Sodium
96. Which substance is used to lower down the melting point of alumina?
(A) Cryolite
(B) Copper Sulphate
(C) Limonite
(D) Bauxite
97. With what does Zinc react to form metal oxide with release of hydrogen
gas?
(A) Hot water
(B) Steam
(C) Oxygen
(D) Cold water
98. With what is iron heated to get interstitial compound?
(A) Aluminum
(B) Nickel
(C) Carbon and Nitrogen
Silicon
99. The molecular formula of Bauxite is (A) Al2O3 · 2H2O
(B) Al2O3
(C) Fe2O3
(D)
(D) Al2O3 · H2O
100. In blast furnace, the reaction between coke and hot air to give CO2 is of
which type?
(A) Endothermic
(B) Adiabatic
(C) Isothermal
(D) Exothermic
101. Which metal oxide shows acidic and basic behavoiour?
(A) Al2O3
(B) PbO
(C) Na2O
(D) CaO
Answers:
01 : A B C
C D 

04 : A B C
C D 

07 : A B C
C D 

10 : A B C
C D 

13 : A B C
C D 

16 : A B C
C D 
D  02 : A B C D  03 : A B
D  05 : A B C D  06 : A B
D  08 : A B C D  09 : A B
D  11 : A B C D  12 : A B
D  14 : A B C D  15 : A B
D  17 : A B C D  18 : A B

19 : A B C
C D 

22 : A B C
C D 

25 : A B C
C D 

28 : A B C
C D 

31 : A B C
C D 

34 : A B C
C D 

37 : A B C
C D 

40 : A B C
C D 

43 : A B C
C D 

46 : A B C
C D 

49 : A B C
C D 

52 : A B C
C D 

55 : A B C
C D 

58 : A B C
C D 

61 : A B C
C D 

64 : A B C
C D 

67 : A B C
D  20 : A B C D  21 : A B
D  23 : A B C D  24 : A B
D  26 : A B C D  27 : A B
D  29 : A B C D  30 : A B
D  32 : A B C D  33 : A B
D  35 : A B C D  36 : A B
D  38 : A B C D  39 : A B
D  41 : A B C D  42 : A B
D  44 : A B C D  45 : A B
D  47 : A B C D  48 : A B
D  50 : A B C D  51 : A B
D  53 : A B C D  54 : A B
D  56 : A B C D  57 : A B
D  59 : A B C D  60 : A B
D  62 : A B C D  63 : A B
D  65 : A B C D  66 : A B
D  68 : A B C D  69 : A B
C D 

70 : A B C D  71 :
C D 

73 : A B C D  74 :
C D 

76 : A B C D  77 :
C D 

79 : A B C D  80 :
C D 

82 : A B C D  83 :
C D 

85 : A B C D  86 :
C D 

88 : A B C D  89 :
C D 

91 : A B C D  92 :
C D 

94 : A B C D  95 :
C D 

97 : A B C D  98 :
C D 

100 : A B C D 101
A B C D  72 : A B
A B C D  75 : A B
A B C D  78 : A B
A B C D  81 : A B
A B C D  84 : A B
A B C D  87 : A B
A B C D  90 : A B
A B C D  93 : A B
A B C D  96 : A B
A B C D  99 : A B
: A B C D 