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Metallurgy one marks part2

12th Standard EM

    Reg.No. :
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Chemistry

choose the correct answer:
Time : 00:30:00 Hrs
Total Marks : 20
    Part-A
    20 x 1 = 20
  1. 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

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

    (a)

    Al

    (b)

    Ni

    (c)

    Cu

    (d)

    Zn

  3. 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

  4. Cupellation is a process used for the refining of

    (a)

    Silver

    (b)

    Lead

    (c)

    Copper

    (d)

    iron

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

    (a)

    Fe

    (b)

    Cu

    (c)

    Mg

    (d)

    Zn

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

    (a)

    Leaching

    (b)

    Roasting

    (c)

    Froth floatation

    (d)

    Both (a) and (c)

  7. 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

  8. 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)

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

  9. 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

  10. 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

  11. 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)

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

  12. 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)

  13. 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

  14. Ignition mixture used in aluminothermite process is

    (a)

    Cr + AI2O3

    (b)

    Mg + BaO2

    (c)

    AI + Cr2O3

    (d)

    Ba+MgO

  15. Malachite has______ composition.

    (a)

    2CuCO3.Cu(OH)2

    (b)

    2CuCO3.Cu(OH)2

    (c)

    Cu2O

    (d)

    Cu2S

  16. 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)

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

  17. 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

  18. Froth floatation process is suitable for concentrating ______ores.

    (a)

    oxide

    (b)

    carbonate

    (c)

    sulphide

    (d)

    halide

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

    (a)

    Calcination

    (b)

    roasting

    (c)

    smelting

    (d)

    beesemerisation

  20. Galena is_________

    (a)

    PbS

    (b)

    ZnS

    (c)

    Ag2S

    (d)

    FeS2

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