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General Principle of Extraction of Metal Test - 1

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General Principle of Extraction of Metal Test - 1
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  • Question 1
    1 / -0

    Sulphide ores are generally concentrated by

    Solution

    Froth floatation method is based on the fact that the surface of sulphide ores is preferentially wetted by oil while that of gangue is wetted by water.

     

  • Question 2
    1 / -0

    Magnetic separation is used for increasing concentration of the following

    Solution

    Haematite (Fe2O3) 

    Iron ores are concentrated by this method

     

  • Question 3
    1 / -0

    The substance added in water in the froth floatation process is

    Solution

    Pine oil is foaming agent. Now another substance collector such as potassium ethyl xanthate or amyl xanthate are added.

     

  • Question 4
    1 / -0

    For which ore of the metal, froth floatation method is used for concentration

    Solution

    Cinnabar (HgS) the ore of mercury is concentrated by froth floatation process.

     

  • Question 5
    1 / -0

    Cyanide process is used in the extraction of

    Solution

    Cyanide process is used in the extraction of both Silver and Gold because these form complex salts with CN- ion due to presence of lone pair of electron on nitrogen atom.

     

  • Question 6
    1 / -0

    Cassiterite is concentrated by

    Solution

    Cassiterite SnO2 or tinstone – an ore of tin being non-magnetic can be separated from magnetic impurities like Fe and Mn from this method.

     

  • Question 7
    1 / -0

    Bauxite ore is concentrated by

    Solution

    Chemical separation or Leaching.

    In this powdered ore is treated with a suitable reagent which can dissolve the ore but not the impurities.

     

  • Question 8
    1 / -0

    In extraction of copper, we use

    Solution

    Copper pyrite CuFeS 2 (Chalcopyrite)

     

  • Question 9
    1 / -0

    Copper pyrites are concentrated by

    Solution

    Sulphides ores are always concentrated by froth floatation process

     

  • Question 10
    1 / -0

    An ore like zinc blende is concentrated by

    Solution

    Froth floatation because it is sulphide ore (ZnS)

     

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