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General Principles and Processes of Isolation of Elements Test - 63

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General Principles and Processes of Isolation of Elements Test - 63
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which metal is generally found in native state?
    Solution

  • Question 2
    1 / -0
    The impurities present in the mineral are called : 
    Solution

  • Question 3
    1 / -0
    In a mixture of $$PbS, ZnS, $$ and $$FeS$$, each component is separated from the other by using the reagents in which of the following sequence in the froth floatation process?
  • Question 4
    1 / -0
    Select the correct statement:
    Solution
    Dolomite - $$MgCO_3.CaCO_3$$ ; Ore of Magnesium  
    Galena - $$PbS$$ ; Ore of lead 
    Pyrolusite - $$MnO_2$$ ; Ore of Manganese
    Cassiterite - $$SnO_2$$ ; Ore of Tin

  • Question 5
    1 / -0
    A mineral is called ore if:
    Solution
    An ore contains minerals with important elements including metals that can be extracted from the rock at a profit.
  • Question 6
    1 / -0
    During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are:
  • Question 7
    1 / -0
    Froth floatation process is used for the :
    Solution
    The principal of froth floatation is the difference in the wetting properties of the ore and gangue particles with water. This method is used for the sulphide ores which gets preferably wet by the oil and the gangue with the water.

    Hence, the correct option is (B).
  • Question 8
    1 / -0
    The ore that is concentrated by forth floatation process is:
    Solution
    The froth floatation process is used for the concentration of the low-grade sulphide ores. The principal of this process is that gangue and ore particles have a different degree of wettability with water and pine oil.

    As cinnabar is HgS, it is concentrated by froth floatation process.

    Hence, the correct option is (A).
  • Question 9
    1 / -0
    Which of the following ores is not concentrated by froth floatation process?
    Solution
    Froth floatation method is commonly used for the concentration of the low-grade sulphide ore. The principal is based on the fact that gangue and ore particles have a different degree of wettability with water and pine oil. The ore particles are wetted by oil whereas gangue particles are wetted by water.

    Copper pyrite is a sulphide ore ($$CuFeS_{2}$$). Pentlandite is an iron-nickel sulphide ore $$(Fe,Ni)_{9}S_{8}$$ and zinc blende ($$ZnS$$) is also a sulphide ore hence it is concentrated by froth floatation process. While Pyrolusite is an oxide ore ($$MnO_{2}$$) and cannot be concentrated by this process.

    Hence, (C) is the correct option.
  • Question 10
    1 / -0
    Zone refining is based on the principle of:
    Solution

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