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General Principles of Isolation of Elements Test - 8

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General Principles of Isolation of Elements Test - 8
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  • Question 1
    1 / -0

    Fe is extracted from its oxides by reduction with CO in the blast furnace to get pig iron, which contains about 4% carbon. This carbon is removed by heating with

    Solution

    All of the above given options are correct for the removal of carbon by heating.

     

  • Question 2
    1 / -0

    When compared to ΔGo for the formation of Al2O3, the ΔGo for the formation of Cr2O3 is

    Solution

    Al acts as a good reducing agent and reduces oxides of metal like Cr, Fe, Mn, etc.

    Cr2O3 + 2Al → 2Cr + Al2O3 + heat

    Therefore, ΔG° for the formation of Al2O3 is lower in comparison to ΔG° for the formation of Cr2O3.

     

  • Question 3
    1 / -0

    According to Ellingham diagram, the oxidation reaction of carbon to carbon monoxide may be used to reduce which of the following oxides at the lowest temperature?

    Solution

    In the graph of DrGo vs T for the formation of oxides, Cu2O line is almost at the top. So, it is quite easy to reduce oxide ores of copper directly to the metal by heating with coke.

    Cu2O + C → 2Cu + CO

     

  • Question 4
    1 / -0

    What are the oxidation states of the metal in the minerals magnetite and haematite?

    Solution

    Haematite is Fe2O3.
    The oxidation state of Fe in Fe2O3 is +III.
    Magnetite ore is FeO.Fe2O3 (≡Fe3O4).
    The oxidation states of Fe in this ore are +II (in FeO) and +III (in Fe2O3).

     

  • Question 5
    1 / -0

    In the metallurgy of aluminium, purified Al2O3 is mixed with

    A. Na3AlF6
    B. CaF2
    C. NaF
    D. AlF3

    Solution

    In the metallurgy of aluminium, purified Al2O3 is mixed with Na3AlF6 or CaF2, which lowers the melting point of the mix and increase conductivity.

     

  • Question 6
    1 / -0

    Which of the following is used as a reducing agent in the cyanide extraction process of silver from argentite ore?

    Solution

    Silver is extracted from the ore-argentite (Ag2S) by the cyanide process as sodium cyanide solution is used.
    AgS + 4NaCN ⇌ 2Na[Ag(CN)2] + Na2S
    Silver is precipitated from the solution by addition of zinc powder.
    2Na[Ag(CN)2] + Zn → Na2[Zn(CN)4] + 2Ag
    Silver gets reduced from Ag(+1) to Ag(0).

     

  • Question 7
    1 / -0

    Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?

    Solution

    Some extractions are based on oxidation, particularly for non-metals. A very common example of extraction based on oxidation is the extraction of chlorine from brine.

     

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