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General Principles of Isolation of Elements Test - 1

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

    Which mineral is common to the ores carnallite, magnesite and dolomite?

    Solution

    Dolomite: CaCO3.MgCO3
    Magnesite: MgCO3
    Carnallite: KCl.MgCl2.6H2O

     

  • Question 2
    1 / -0

    The ore of tin containing FeCrO4 can be concentrated by

    Solution

    For concentrating an ore with magnetic separation technique, either the ore particles or the gangue associated with it, should possess magnetic properties. So, an ore of tin containing FeCrO4 is concentrated by magnetic separation as FeCrO4 is ferromagnetic in nature.

     

  • Question 3
    1 / -0

    All sulphide ores are extracted by froth floatation method except

    Solution

    Silver metal is extracted from argentite ore by hydrometallurgy or leaching which involves the following steps:

    The ore is dissolved in sodium cyanide solution.
    Ag2S + 4NaCN → 2Na[Ag(CN)2] + Na2S

    By the addition of zinc turnings, Ag is precipitated out.
    2Na[Ag(CN)2] + Zn → Na2[Zn(CN)]4 + 2Ag

     

  • Question 4
    1 / -0

    What is the process of isolation of a metal by dissolving the ore in a suitable electrolyte, followed by precipitation of the metal by displacement by a more electropositive metal called?

    Solution

    Hydrometallurgy is a method of selective leaching of metallic compounds to form a solution from which the metals can be precipitated and recovered. Leaching processes are used when it is the simplest method or when the ore is of too low a grade for more expensive extractive procedures.

     

  • Question 5
    1 / -0

    Consider the following statements:

    I. In the precipitation of Ag from sodium dicyano argentate (I), zinc acts as the reducing agent as well as a complexing agent.
    II. In the process of roasting, the copper pyrite is converted into mixture of Cu2S and FeS, which are then partially oxidised.
    III. Tin and lead are extracted from their ores by self reduction method.

    Which of the above statements is/are false?

    Solution

    Statements I and II are correct while statement III is false as tin and lead are extracted by reduction of their oxides with carbon.
    SnO2 + 2C → Sn + 2CO

     

  • Question 6
    1 / -0

    Consider the following statements independently regarding the formation of slag obtained during the extraction of metals like copper and iron and choose the appropriate answer accordingly.

    I. The slag is lighter and has a lower melting point than the metal.
    II. The slag is formed by the combination of the impurity with a flux.
    III. The flux added during the extraction of iron from its oxide is basic.

    Solution

    All the three statements are correct. The flux combines with the impurity to make it fusible, which being lighter floats on the metal.
    The ore of iron contains an acidic impurity, SiO2, and so the flux added is basic, which is CaO.

     

  • Question 7
    1 / -0

    The reducing agent in the process of smelting is

    Solution

    Smelting is the process of reduction using carbon as the reducing agent. Since gaseous oxides of carbon are formed as products, the process is carried out in a blast furnace.

     

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