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12th Chemistry - Metallurgy Model Question Paper 1 8682895000 Jan-06 , 2020

Metallurgy

12th Chemistry - Metallurgy Model Question Paper 1

Metallurgy Model Question Paper 1

12th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5

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

    (a)

    Al

    (b)

    Ni

    (c)

    Cu

    (d)

    Zn

  2. 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

  3. Wolframite ore is separated from tinstone by the process of________.

    (a)

    Smelting

    (b)

    Calcination

    (c)

    Roasting

    (d)

    Electromagnetic separation

  4. Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.

    (a)

    Distillation

    (b)

    Zone refining

    (c)

    Displacement with zinc

    (d)

    liquation

  5. 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 : \({ Fe }_{ 2 }{ O }_{ 3 }3C\rightarrow 3CO+2Fe\)

    6. 5 x 2 = 10

  6. What is the role of quick lime in the extraction of Iron from its oxide Fe2O3?

  7. Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

  8. Name some elements that occur as native elements.

  9. Write the two similarities between calcination and roasting.

  10. What is distillation?

    11. 5 x 3 = 15

  11. Explain zone refining process with an example.

  12. Explain the electrometallurgy of aluminium.

  13. Give the basic requirement for vapour phase refining.

  14. What is meant by ammonia leaching?

  15. Explain roasting with an example.

    16. 4 x 5 = 20

  16. The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

  17. Write a short note on electrochemical principles of metallurgy.

  18. Explain concentration by magnetic separation with diagram.

  19. What is zone refining? Describe the principle involved in the purification of the metal by this method.

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