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General Principles and Processes of Isolation of Elements Test - 6

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General Principles and Processes of Isolation of Elements Test - 6
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  • Question 1
    1 / -0

    In the froth floatation process for the concentration of ore, the particles float because

    Solution

    In froth floatation gangue particles get wetted by water and particles of metal get wetted by oil. So ore particles come/float to the top.

  • Question 2
    1 / -0

    Which among the following act as froth stabilizer?

    Solution

    During froth flotation, substances are used to stabilize the froth so that it can be easily skimmed off and purified. Aniline and cresols are froth stabilizers.

  • Question 3
    1 / -0

    Which among the following is a chemical process?

    Solution

    Leaching is a process in which ore is digested with a solvent to form a soluble complex.

    Example: Leaching of aluminia from bauxite.

  • Question 4
    1 / -0

    Impurities associated with bauxite ore is/are

    Solution

    Bauxite ore has silica, TiO2 and Fe2O3 as impurities.

  • Question 5
    1 / -0

    Which among the following act as flux , if iron oxide is present as an impurity?

    Solution

    Iron oxide is basic oxide so flux should be acidic.

    FeO + SiO2 → FeSiO3 (slag)

  • Question 6
    1 / -0

    Which of the following metals cannot be extracted by smelting process?

    Solution

    Al cannot be extracted by smelting because bauxite have a very high melting point, so the overall extraction of Al from bauxite becomes very costly.

  • Question 7
    1 / -0

    The furnace which gives the highest temperature is

    Solution

    Blast furnance maintains required highest temperature for extraction of metals.

  • Question 8
    1 / -0

    At 1123 K temperature in the blast furnace, CO reduces

    Solution

    At this temperature range free energy for the process is negative and CO acts as reducing agent.

    FeO + CO → Fe + CO2

  • Question 9
    1 / -0

    Which among the following is not a basic flux?

    Solution

    SiO2 is acidic flux because Si is metalloid. Rest other are basic oxides/metallic oxides.

  • Question 10
    1 / -0

    The distillation process is used for the purification of

    Solution

    Hg is purified by distillation, which is obtained from cinnabar.

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