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General Principles of Isolation of Elements Test - 6

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

    When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then

    Solution

    When a metal is to be extracted from its ore, if the gangue associated with the ore is silica, then a basic flux is needed.

     

  • Question 2
    1 / -0

    Which of the following methods is correct for separation of an ore of tin containing FeCrO4?

    Solution

    An ore of tin containing FeCrO4 is concentrated by magnetic separation as FeCrO4 is ferromagnetic in nature.

     

  • Question 3
    1 / -0

    Xanthates are used as collectors in the froth floatation process because they

    Solution

    Froth floatation method has been in use for removing gangue from sulphide ores. In this process, a suspension of the powdered ore is made with water. To it, collectors and froth stabilisers are added. Collectors (e.g. pine oils, fatty acids, xanthates, etc.) enhance non-wettability of the mineral particles and froth stabilizers (e.g. cresols, aniline) stabilise the froth.

     

  • Question 4
    1 / -0

    In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

    Solution

    It is an example of auto reduction.
    2Cu2O + Cu2S → 6Cu + SO2

     

  • Question 5
    1 / -0

    Blister copper is refined by stirring molten impure metal with green logs of wood because such a log liberates hydrocarbon gases. The metal contains impurities of ________ and this process is called _______.

    Solution

    This process is called polling and is applied only when metals like impure Cu contain the impurities of their own oxides, like Cu2O, which get reduced by gases liberated by green logs of wood.

     

  • Question 6
    1 / -0

    Van Arkel method of purification of metals involves converting the metal into a

    Solution

    In this method, the metal is converted into its volatile compound and collected elsewhere. It is then decomposed to give pure metal.

     

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