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General Princip...

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  • Question 1
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    The mass of carbon anode consumed (giving the only carbon dioxide) in the production of $$270\ kg$$ of aluminium metal from bauxite by the Hall process is:
    [Atomic mass : $$Al = 27$$]

  • Question 2
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    Choose the correct statement(s) for froth flotation process, which is used for the concentration of sulphide ore.
    a) It is based on the difference in the ability of different minerals to become wet.
    b) It uses sodium ethyl xanthate, $$C_{2}H_{5}OCS_{2}Na$$ as collector.
    c) It uses $$NaCN$$ as a depressant in the mixture of $$ZnS$$ and $$PbS$$, where $$ZnS$$ forms soluble complex and $$PbS$$ forms froth.

  • Question 3
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    Select the correct statement for electrolysis of $$Al_2O_3$$ by Hall-Heroult process.

  • Question 4
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    The main function of frothers is to _________________.

  • Question 5
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    Froth floatation process is used for the concentration of sulphide ores. This process is an illustration of the practical application of:

  • Question 6
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    Which of the following reaction is a part of Hall's process?

  • Question 7
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    Directions For Questions

    The Ellingham diagram for zinc, magnesium and carbon converting into corresponding oxides is shown above. In the diagram, the points shown are melting and boiling points of zinc and magnesium metals. $$\Delta G^o$$ is a function of temperature for some reactions of extractive metallurgy.

    ...view full instructions

    At what temperature do zinc and carbon have equal affinity for oxygen?

  • Question 8
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    Concentration of which of the following ore is carried out by froth floatation process?

  • Question 9
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    Which of the following reactions does not occur in Bessemer's converter?

  • Question 10
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    Which of the following is not correctly matched with respect to the processes involved in the extractive metallurgy of the respective metal?

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