Metallurgy Important Questions

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. Bauxite has the composition

    (a)

    Al2O3

    (b)

    Al2O3nH2O

    (c)

    Fe2O3.2H2O

    (d)

    None of these

  2. Wolframite ore is separated from tinstone by the process of

    (a)

    Smelting

    (b)

    Calcination

    (c)

    Roasting

    (d)

    Electromagnetic separation

  3. Electrochemical process is used to extract

    (a)

    Iron

    (b)

    Lead

    (c)

    Sodium

    (d)

    silver

  4. 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

  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. 5 x 2 = 10
  7. What is the difference between minerals and ores?

  8. Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

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

  10. Why should we have a ecofriendly metallurgical process?

  11. Can the same method of extraction be used for all metals

  12. 5 x 3 = 15
  13. Explain zone refining process with an example using the Ellingham diagram given below

  14. Give the uses of zinc.

  15. Give the basic requirement for vapour phase refining.

  16. What is meant by ammonia leaching?

  17. Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

  18. 4 x 5 = 20
  19. The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

  20. Give the limitations of Ellingham diagram

  21. In the extraction of copper, explain the smelting process.

  22. Explain refining of nickel by mond's process

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