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General Princip...

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  • Question 1
    1 / -0

    In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false?

  • Question 2
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    Which one of the following ores is best concentrated by froth floatation method?

  • Question 3
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    The refining method used when the metal and the impurities have low and high melting temperatures, respectively, is :

  • Question 4
    1 / -0

    The correct statement is :

  • Question 5
    1 / -0

    Which one of the following ores is best concentrated by froth-floatation method? 

  • Question 6
    1 / -0

    Match items of Column I with the items of Column II and assign the correct code:


    Column IColumn 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 $$Ni$$

  • Question 7
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    Considering Ellingham diagram, which of the following metals can be used to reduced alumina?

  • Question 8
    1 / -0

    Bell metal is an alloy of:

  • Question 9
    1 / -0

    Semiconductor materials like $$Si$$ and $$Ge$$ are usually purified by:

  • Question 10
    1 / -0

    Cinnabar is an ore of :

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