" /> -->

Metallurgy one marks

12th Standard EM

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Chemistry

choose the correct answer:
Time : 02:00:00 Hrs
Total Marks : 100
    Part-A
    73 x 1 = 73
  1. Bauxite has the composition

    (a)

    Al2O3

    (b)

    Al2O3nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

    (a)

    CO2

    (b)

    So3

    (c)

    SO2

    (d)

    H2S

  3. Which one of the following reaction represents calcinations?

    (a)

    \(2Zn+{ O }_{ 2 }\rightarrow 2ZnO\)

    (b)

    \(2ZnS+3O_{ 2 }\rightarrow 2ZnS+3O_{ 2 }\rightarrow 2ZnO_{ 2 }\rightarrow 2ZnO+2SO_{ 2 }\)

    (c)

    \(MgCO_{ 3 }\rightarrow MgO+CO_{ 2 }\)

    (d)

    Both (a) and (c)

  4. The metal oxide which cannot be reduced to metal by carbon is

    (a)

    PbO

    (b)

    AL2O3

    (c)

    ZnO

    (d)

    Feo

  5. Which of the metal is extracted by Hall-Heroult process?

    (a)

    Al

    (b)

    Ni

    (c)

    Cu

    (d)

    Zn

  6. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

    (a)

    \(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S

    (b)

    \(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

    (c)

    Roasting of the sulphide to its oxide is thermodynamically feasible

    (d)

    Carbon and hydrogen are suitable reducing agents for metal sulphides

  7. Match items in column - I with the items of column – II and assign the correct code.
     

           Column-I      Column-II
    A. Cyanide process (i) Ultrapure Ge
    B Froth floatation process (ii) Dressing of ZnS
    C Electrolytic reduction (iii) Extraction of Al
    D Zone refining (iv) Extraction of Au
        (v) Purification of Ni
    (a)
    A B C D
           
    (b)
    A B C D
    (i) (ii) (iii) (iv)
    (c)
    A B C D
    (iii) (iv) (v) (i)
    (d)
    A B C D
    (ii) (iii) (i) (v)
  8. Wolframite ore is separated from tinstone by the process of

    (a)

    Smelting

    (b)

    Calcination

    (c)

    Roasting

    (d)

    Electromagnetic separation

  9. Which one of the following is not feasible

    (a)

    \(Zn(s)+C{ u }^{ 2+ }\left( aq \right) \rightarrow Cu\left( s \right) +{ Zn }^{ 2+ }(aq)\)

    (b)

    \(Cu(s)+Z{ n }^{ 2+ }(aq)\longrightarrow Zn(s)+{ Cu }^{ 2+ }(aq)\)

    (c)

    \(Cu(s)+2Ag^{ + }(aq)\longrightarrow Ag(s)+{ Cu }^{ 2+ }(aq)\)

    (d)

    \(Fe(s)+{ Cu }^{ 2+ }(aq)\longrightarrow Cu(s)+{ Fe }^{ 2+ }(aq)\)

  10. Electrochemical process is used to extract

    (a)

    Iron

    (b)

    Lead

    (c)

    Sodium

    (d)

    silver

  11. Flux is a substance which is used to convert

    (a)

    Mineral into silicate

    (b)

    Infusible impurities to soluble impurities

    (c)

    Soluble impurities to infusible impurities

    (d)

    All of these

  12. Which one of the following ores is best concentrated by froth – floatation method?

    (a)

    Magnetite

    (b)

    Hematite

    (c)

    Galena

    (d)

    Cassiterite

  13. In the extraction of aluminium from alumina by electrolysis, cryolite is added to

    (a)

    Lower the melting point of alumina

    (b)

    Remove impurities from alumina

    (c)

    Decrease the electrical conductivity

    (d)

    Increase the rate of reduction

  14. Zinc is obtained from ZnO by

    (a)

    Carbon reduction

    (b)

    Reduction using silver

    (c)

    Electrochemical process

    (d)

    Acid leaching

  15. Cupellation is a process used for the refining of

    (a)

    Silver

    (b)

    Lead

    (c)

    Copper

    (d)

    iron

  16. Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by (NEET-2017)

    (a)

    Distillation

    (b)

    Zone refining

    (c)

    Displacement with zinc

    (d)

    liquation

  17. Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

    (a)

    Fe

    (b)

    Cu

    (c)

    Mg

    (d)

    Zn

  18. The following set of reactions are used in refining Zirconium 
    \((impure)+2I_{ 2 }\overset { 523k }{ \longrightarrow } ZrI_{ 4 }\)
    \({ ZrI }_{ 4 }\overset { 1800K }{ \longrightarrow } Zr(pure)+{ 2I }_{ 2 }\) 
    This method is known as 

    (a)

    Liquation

    (b)

    van Arkel process

    (c)

    Zone refining

    (d)

    Mond’s process

  19. Which of the following is used for concentrating ore in metallurgy?

    (a)

    Leaching

    (b)

    Roasting

    (c)

    Froth floatation

    (d)

    Both (a) and (c)

  20. The incorrect statement among the following is

    (a)

    Nickel is refined by Mond’s process

    (b)

    Titanium is refined by Van Arkel’s process

    (c)

    Zinc blende is concentrated by froth floatation

    (d)

    In the metallurgy of gold, the metal is leached with dilute sodium chloride solution

  21. In the electrolytic refining of copper, which one of the following is used as anode?

    (a)

    Pure copper

    (b)

    Impure copper

    (c)

    Carbon rod

    (d)

    Platinum electrode

  22. Which of the following plot gives Ellingham diagram

    (a)

    \(\Delta SVsT\)

    (b)

    \(\Delta { G }^{ 0 }VsT\)

    (c)

    \(\Delta { G }^{ 0 }Vs\cfrac { 1 }{ T } \)

    (d)

    \(\Delta { G }^{ 0 }Vs{ T }^{ 2 }\)

  23. In the Ellingham diagram, for the formation of carbon monoxide

    (a)

    \(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \)

    (b)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive

    (c)

    \(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

    (d)

    initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

  24. Which of the following reduction is not thermodynamically feasible?

    (a)

    \({ Cr }_{ 2 }{ O }_{ 3 }+2Al\longrightarrow { Al }_{ 2 }{ O }_{ 3 }+2Cr\)

    (b)

    \({ Al }_{ 2 }{ O }_{ 3 }+2Cr\longrightarrow { Cr }_{ 2 }{ O }_{ 3 }+2Sl\)

    (c)

    \(3Ti{ O }_{ 2 }+4Al\longrightarrow 2A{ l }_{ 2 }{ O }_{ 3 }+3Ti\)

    (d)

    none of these

  25. Which of the following is not true with respect to Ellingham diagram?

    (a)

    Free energy changes follow a straight line. Deviation occurs when there is a phase change.

    (b)

    The graph for the formation of CO2 is a straight line almost parallel to free energy axis.

    (c)

    Negative slope of CO shows that it becomes more stable with increase in temperature

    (d)

    Positive slope of metal oxides shows that their stabilities decrease with increase in temperature

  26. Which metal is used for extraction of Au and Ag and also for galvanisation of iron objects?

    (a)

    Mg

    (b)

    Zn

    (c)

    Cr

    (d)

    Co

  27. Which of the following is not a mineral of aluminium?

    (a)

    Bauxite

    (b)

    Cryolite

    (c)

    China clay

    (d)

    Malachite

  28. Which of the following is commonly used to produce foam in froth floatation process?

    (a)

    Pine oil

    (b)

    Cresol

    (c)

    NaCN

    (d)

    Xanthate

  29. Among the following, one does not belong to calcination, Pick the odd one out.

    (a)

    \({ PBCO }_{ 3 }\overset { \Delta }{ \longrightarrow } PBO+{ CO }_{ 2 }\uparrow \)

    (b)

    \({ CaCo }_{ 3 }\overset { \Delta }{ \longrightarrow } Cao+{ CO }_{ 2 }\uparrow \)

    (c)

    \(PbS{ O }_{ 3 }\overset { \Delta }{ \rightarrow } PbO+{ 2SO }_{ 2 }\uparrow \)

    (d)

    \({ ZnCO }_{ 3 }\overset { \Delta }{ \rightarrow } ZnO+{ CO }_{ 2 }\uparrow \)

  30. Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

    (a)

    Zone of combustion : \(C+{ O }_{ 2 }\rightarrow { CO }_{ 2 }\)

    (b)

    Zone of heat absorption : \({ CO }_{ 2 }\rightarrow C+{ O }_{ 2 }\)

    (c)

    Zone of slag formation : \(CaO+{ SiO }_{ 2 }\rightarrow CaSiO_{ 3 }\)

    (d)

    Zone of reduction : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

  31. Name the process by which elements such as germanium, silicon and galium are refined.

    (a)

    Vapour phase method

    (b)

    Electrolytic refining

    (c)

    Zone refining

    (d)

    Van-Arkel method

  32. Which of the following will give respective metal by self reduction?

    (a)

    Galena (Pbs)

    (b)

    HgS

    (c)

    ZnS

    (d)

    Both (a) & (b)

  33. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

    (a)

    Iron sulphide (FeS)

    (b)

    Carbon monoxide (CO)

    (c)

    Copper (I) sulphide (Cu2S)

    (d)

    Sulphur dioxide (S02)

  34. Which among the following reaction represents the formation of slag?

    (a)

    \(Ca{ O }_{ (s) }+{ SiO }_{ 2(s) }\longrightarrow { CaSiO }_{ 3(s) }\)

    (b)

    \({ 2C }_{ (s) }+{ O }_{ 2(g) }\longrightarrow { 2CO }_{ (g) }\)

    (c)

    \({ Fe }_{ 2 }{ O }_{ 3 }+{ 3CO }_{ (g) }\longrightarrow 2{ Fe }_{ (l) }+{ 3CO }_{ 2(g) }\)

    (d)

    \({ CaCO }_{ 3(g) }\longrightarrow { CaO }_{ (s) }+{ CO }_{ 2(g) }\)

  35. Which one of the following element is present as a~ impurity in pig iron?

    (a)

    Phosphorus

    (b)

    Manganese

    (c)

    Carbon

    (d)

    Silicon

  36. Which of the following mineral contains calcium as well as magnesium?

    (a)

    Zinc bien de

    (b)

    Aragonite

    (c)

    Dolomite

    (d)

    Carnalite

  37. In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

    (a)

    Non-wettability of the mineral particles in froth.

    (b)

    Non-wettability of the mineral particles in water

    (c)

    Non-wettability of the gangue particles in froth

    (d)

    Non-wettability of the gangue particles in water

  38. Concentration of copper glance is done by

    (a)

    leaching

    (b)

    magnetic separation

    (c)

    froth flotation

    (d)

    hydraulic washing

  39. Identify the decreasing order of carbon content in different forms of iron

    (a)

    Wrought iron> Pig iron> castiron

    (b)

    Castiron > Pig iron> Wrought iron

    (c)

    Pig iron> Cast iron> Wrought iron

    (d)

    Cast iron> Wrought iron> Pig iron

  40. Sodium. magnesium and aluminum can be obtained from their ore by

    (a)

    electro metallurgy

    (b)

    pyro metallurgy

    (c)

    hydro metallurgy

    (d)

    smelting

  41. The blistered appearance of Cu obtained from the reverberatory furance is due to evolution of

    (a)

    CO2 gas

    (b)

    S02 gas

    (c)

    NO2

    (d)

    Due to evaporation of volatile materials

  42. Identify the halide ore among the following

    (a)

    Epsom Salt

    (b)

    Pyrolusite

    (c)

    Anglesite

    (d)

    Rock Salt

  43. Identify the metal that occurs in free state

    (a)

    Al

    (b)

    Au

    (c)

    Mg

    (d)

    Ca

  44. \(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process

    (a)

    Roasting

    (b)

    Calcination

    (c)

    Smelting

    (d)

    Leaching

  45. The process of heating of copper pyrites to remove sulphur is called

    (a)

    froth flotation

    (b)

    roasting

    (c)

    calcination

    (d)

    smelling

  46. \(\Delta { G }^{ o }\) vs T plot in the Ellingham's diagram slopes downward the reaction.

    (a)

    \(Mg+\cfrac { 1 }{ 2 } { O }_{ 2 }\longrightarrow MgO\)

    (b)

    \(C+\cfrac { 1 }{ 2 } { O }_{ 2 }\longrightarrow CO\)

    (c)

    \(2Ag+\cfrac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

    (d)

    \(2Ag+\cfrac { 1 }{ 2 } { O }_{ 2 }\longrightarrow { Ag }_{ 2 }O\)

  47. Pick out the alloy that contains a non-metal as a constituent in it

    (a)

    Brass

    (b)

    Bronze

    (c)

    Steel

    (d)

    Invar

  48. Ignition mixture used in aluminothermite process is

    (a)

    Cr + AI2O3

    (b)

    Mg + BaO2

    (c)

    AI + Cr2O3

    (d)

    Ba+MgO

  49. Malachite has______ composition.

    (a)

    2CuCO3.Cu(OH)2

    (b)

    2CuCO3.Cu(OH)2

    (c)

    Cu2O

    (d)

    Cu2S

  50. Zinc blende is_________

    (a)

    ZnS

    (b)

    PbS

    (c)

    Ag2S

    (d)

    Cu2S

  51. In acid leaching process. the insoluble sulphide is converted into soluble sulphate and elemental_________

    (a)

    carbon

    (b)

    lead

    (c)

    sulphur

    (d)

    zinc

  52. Sulphide ore is converted to oxide form by using the process_________

    (a)

    Calcination

    (b)

    Roasting

    (c)

    Smelting

    (d)

    Leavhing

  53. Magnetic separation it is based on the difference in the_________ of the ore and the impurities.

    (a)

    magnetic properties

    (b)

    chemical properties

    (c)

    physical properties

    (d)

    melting point

  54. Zinc is extracted from Zinc blende by_________

    (a)

    Carbon reduction process

    (b)

    Nitrogen reduction process

    (c)

    Oxygen reduction process

    (d)

    All of these

  55. \(ZnS+{ 3O }_{ 2 }\overset { \Delta }{ \longrightarrow } 2ZnO+{ 2SO }_{ 2 }\uparrow \) .The above equation is an example for________.

    (a)

    calcination

    (b)

    reduction

    (c)

    roasting

    (d)

    leaching

  56. Gibb's free energy is given by_______

    (a)

    \(\Delta { G }^{ 0 }=-nF{ E }^{ 0 }\)

    (b)

    \(\Delta { G }^{ o }=nF\)

    (c)

    \(\Delta { G }^{ o }=nF{ E }^{ o }\)

    (d)

    \(\Delta { E }^{ o }=-nF{ G }^{ 0 }\)

  57. Na[Ag(CN)2] is _________.

    (a)

    Sodium aurocyanide

    (b)

    Sodium meta aluminate

    (c)

    Aluminosilicate

    (d)

    Sodium dicyano argentate

  58. \({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2Au{ { u }_{ (s) } }\) In the above equation) the oxidation state of metallic;gold is_______

    (a)

    1

    (b)

    0

    (c)

    +2

    (d)

    -2

  59. Semiconductors are purified by_______method.

    (a)

    Zone refining

    (b)

    Electrolytic refining

    (c)

    Mond's process

    (d)

    Beisemerisation

  60. Magnesite is_________

    (a)

    Magnesium oxide

    (b)

    Magnesium carbonate

    (c)

    Magnesium sulphate

    (d)

    Magnesium chloride

  61. The following set of reaction is used for refming titanium. This method is known as___________
    \({ Ti }_{ (g) }+{ 2I }_{ 2(s) }\longrightarrow { TiI }_{ 4 }\left( vapour \right) \)
    \({ Til }_{ 4 }(va[pour)\longrightarrow Ti_{ (g) }+{ 2I }_{ 2(s) }\)

    (a)

    Hall Herold process

    (b)

    Mond process

    (c)

    Van-Arkel process

    (d)

    Alumino thermic process

  62. In the metallurgy of iron) limestone is added to coke. Which acts as a_______

    (a)

    Reducing agent

    (b)

    Oxidising agent

    (c)

    Slag

    (d)

    Flux

  63. A mixture containing sulphides of copper and iron is called______

    (a)

    mineral

    (b)

    ore

    (c)

    matte

    (d)

    matrix

  64. Cinnabar is the sulphide ore of_________metal.

    (a)

    Zn

    (b)

    Pb

    (c)

    Hg

    (d)

    Ag

  65. The percentage of carbon in high carbon steel is_________

    (a)

    0.5 - 1%

    (b)

    0.15 - 1.5%

    (c)

    0.15 - 1.5%

    (d)

    0.15 - 0.3%

  66. Froth floatation process is suitable for concentrating ______ores.

    (a)

    oxide

    (b)

    carbonate

    (c)

    sulphide

    (d)

    halide

  67. Steelis an alloy of___________

    (a)

    iron and carbon

    (b)

    iron and calcium

    (c)

    copper and carbon

    (d)

    copper and iron

  68. Metal oxide is converted into metal by the:_______ process.

    (a)

    Calcination

    (b)

    roasting

    (c)

    smelting

    (d)

    beesemerisation

  69. Sodium cyanide solution is used to extract _________from its ores

    (a)

    copper

    (b)

    silver

    (c)

    gold

    (d)

    both (b) and (c)

  70. In the thermite proces__________is used as a reducing agent

    (a)

    AI

    (b)

    CO

    (c)

    C

    (d)

    CO2

  71. Galena is_________

    (a)

    PbS

    (b)

    ZnS

    (c)

    Ag2S

    (d)

    FeS2

  72. \(HgS_{ (s) }+{ O }_{ 2(g) }\longrightarrow { Hg }_{ (l) }+{ SO }_{ 2 }\uparrow \) The above reaction is an example of _________reduction.

    (a)

    metal

    (b)

    hydrogen

    (c)

    carbon

    (d)

    auto

  73. In Hall-Herold process___________act as an, anode.

    (a)

    Carbon blocks

    (b)

    hydrogen

    (c)

    copper rods

    (d)

    Zinc rods

  74. 20 x 1 = 20
  75. Copper pyrite

  76. (1)

    Zn

  77. Malachite

  78. (2)

    Calamine

  79. Azurite

  80. (3)

    Fe

  81. Cuprite

  82. (4)

    Bauxite

  83. Calamine

  84. (5)

    2CuCO3.Cu(OH)2

  85. Azurite

  86. (6)

    Copper pyrite

  87. Limonite

  88. (7)

    Zinc Blende

  89. Cerrusite

  90. (8)

    Angelsite

  91. Gravity separation

  92. (9)

    Tin

  93. Froth floatation

  94. (10)

    Cu2O

  95. Chemical method

  96. (11)

    Tinstone

  97. Electro magnetic separation

  98. (12)

    Cu

  99. Oxide ore

  100. (13)

    Diaspore

  101. Sulphide ore

  102. (14)

    CuFeS2

  103. Sulphate ore

  104. (15)

    Nickel

  105. Carbonate ore

  106. (16)

    Silicon

  107. Liquation

  108. (17)

    Copper

  109. Mond's process

  110. (18)

    Hematite

  111. Zone refining

  112. (19)

    Pb

  113. Electrolytic refining

  114. (20)

    CuCO3CU(OH)2

    7 x 1 = 7
  115. I.All ores are minerals
    II. All minerals are not ores.
    III.Aluminium can be extracted from bauxite.
    IV.Aluminium can be extracted from china clay
    a) Only I
    b) Only II
    c) III & IV
    d) I, II & III

    ()

    I,II,III

  116. I. Copper is the first metal used by the human
    II. Aluminuim is used in galvanising metals
    III. Aluminium is a good conductor of electricity
    IV.Magnets can be made from iron.
    a) Only I
    b) Only II
    c) I, III & IV
    d) III & IV

    ()

     I, III & IV

  117. I.Ellingham diagram helps to select a suitable reducing agent
    II.Magnesite is calcinated to obtain magnesia.
    III.Calcination is a process of cooling substances. 
    IV.Sulphur dioxide is harmful to the environment.
    a) I, II & IV
    b) Only II
    c) Only I
    d) III & IV

    ()

    I, II & IV

  118. I.Froth flotation is used to concentrate sulphide ores.
    II. Magnetic separation is applicable for ferromagnetic ores.
    III. Roasting method used to sulphide ores to oxides
    IV.Magnetic separation is used to concentrate heavy oxide ores.
    a) III & IV
    b) Only II
    c) Only I
    d) I, II & III

    ()

    I, II & III

  119. I.Ores are associated with non-metallic impurities
    II. Ores are associated with rockymaterials
    III. Removal of impurities is known as concentration of ore.
    IV. Ellingham diagram shows the stability of different metal oxides.
    a) I, II, III & IV b
    b) Only II
    c) Only I
    d) III & IV

    ()

    I, II, III & IV

  120. Identify the correct statement(s) with respect to the following reaction.
    \(2Na\left[ Al\left( OH \right) _{ 1 } \right] _{ (aq) }+{ CO }_{ 2(g) }\longrightarrow { Al }_{ 2 }{ O }_{ 3 }.x{ H }_{ 2 }{ O }_{ (g) }+{ 2NaHCO }_{ 3(aq) }\)
    (i) CO2 is acting as a reducing agent.
    (ii) The solution is neutralised by passing CO2 gas to form hydrates Al2O3 precipitate.
    (iii) Insoluble sulphate is converted into soluble sulphate.
    (iv) The precipitate is filtered off and heated around 1670 K to get pure Alumina.
    (a) only (ii)
    (b) only (iv)
    (c) both (ii) & (iv)
    (d) both (i) and (iii)

    ()

    both (ii) (iv)

  121. Identify the correct statement with respect to the following reaction
    \({ Zn }_{ (g) }+2\left[ Au\left( CN \right) _{ 2 } \right] _{ (aq) }^{ - }\longrightarrow \left[ Zn(CN)_{ 4 } \right] _{ 2(aq) }^{ - }+{ 2Au }_{ (s) }\)
    a) The above reaction takes place in extraction of zinc.
    b) Gold is reduced to its elemental state
    c) The process is called ammonia leaching.
    d) The above reaction is an example of cyanide leaching.
    a) III & IV
    c) Only I
    b) II &IV
    d) I, II, III & IV

    ()

    II &IV

*****************************************

TN 12th Standard EM Chemistry free Online practice tests

Reviews & Comments about 12th chemistry - Metallurgy one marks important questions

Write your Comment