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Isolation of Elements Test 10

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Isolation of Elements Test 10
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  • Question 1
    1 / -0

    Formation of metallic copper from the sulphide ore in the commercial thermo-metallurgical process essentially involves which one of the following reaction :

    Solution

    Self reduction process

    2Cu2O + Cu2S → 6Cu + SO2

  • Question 2
    1 / -0

    Ag2S + NaCN + Zn →Ag

    This method of extraction of Ag by complex formation and then its displacement is called :

    Solution

    The process mention is rxn is known as Mc.
    Arthur forest Method :

  • Question 3
    1 / -0

    Calcination is the process of heating the ore :

    Solution

    The correct answer is option C.
    Calcination is a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition, phase transition, or removal of a volatile fraction.
     

  • Question 4
    1 / -0

    Which of the following does not contain Mg :

    Solution

    The correct answer is option A.
    Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe3O4. It does not contain Mg.
    Magnesite is a magnesium carbonate mineral with a chemical composition of MgCO3. 
    Asbestos is CaMg3(SiO3)4.
    Carnallite is an evaporite mineral, a hydrated potassium magnesium chloride with formula KMgCl3⋅6(H2O).

  • Question 5
    1 / -0

    Match the method of concentration of the ore in column I with the ore in column II and select the correct alternate:

    Solution

    Magnete seperation → FeCr2O4
    froath floatation → Ag2S
    gravity separation → Al2 (SiO3)2

  • Question 6
    1 / -0

    Bessemerization is carried out for

    (I) Fe
    (II) Cu
    (III) Al
    (IV) silver

    Solution

    Bessermerisatioin process is used for Fe and Cu

  • Question 7
    1 / -0

    Refining of silver is done by :

    Solution

    By cupellation it is urea for the removal of Pb from Ag and Au

  • Question 8
    1 / -0

    Which of the following is not used for obtaining Ag

  • Question 9
    1 / -0

    Blister Cu is about :

    Solution

    Blister copper is 98 % pure Cu

  • Question 10
    1 / -0

    Which one of the following is not a method of concentration of ore?

    Solution

    S melting is not a process of concn of ore.

  • Question 11
    1 / -0

    In which of the following isolations no reducing agent is required :

    Solution

    Mercury from cinnarbar (HgS)
    (Auto reductant and self reduction) (Cu2S, PbS, HgS)

  • Question 12
    1 / -0

    Chemical leaching is useful in the concentration of :

    Solution

    leaching is used for bauxite

  • Question 13
    1 / -0

    The element which could be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is :

    Solution

    Aluminium oxide could be extracted by electrolysis phenomenon.

  • Question 14
    1 / -0

    Consider the following statements :

    Roasting is carried out to :

    (i) convert sulphide to oxide and sulphate (ii) remove water of hydration

    (iii) melt the ore (iv) remove arsenic and sulphur impurities

    Of these statements :

    Solution

    The correct answer is Option C.
    ROASTING 
    The removal of the excess sulphur contained in sulphide ores by heating in an excess of air is called roasting. The concentrated sulphide ore is heated in a reverberatory furnace, below its melting point or fusion temperature in the presence of an excess of air with or without the addition of an external substance. 
    In roasting definite chemicals like oxidation, chlorination etc. take place but in calcination does not occur any major chemical changes.
     
    Advantages of Roasting :
    (i) Excess of sulphur is removed as volatile oxide. 
    (ii) The metal sulphide is converted into metal oxide and sulphate. 
    (iii) Impurities of arsenic and antimony are removed as their volatile oxides.
     

  • Question 15
    1 / -0

    Iron obtained from blast furance is :

    Solution

    Iron obtained from blast furnace is pig iron

  • Question 16
    1 / -0

    Which one of the following statements is not correct :

    Solution

    (A) Malachite Cu(OH)2 . CuCO3
    (B) Calamine ZnCO3
    (C) Cerussite PbCO3
    Stellite is an ore

  • Question 17
    1 / -0

    Which of the following is not an ore :

    Solution

    Some transition metal can form poly nuclear metal carbonyls also.

  • Question 18
    1 / -0

    In the extraction of nickel by Mond process, the metal is obtained by :

    Solution

    Thermal decomposition

  • Question 19
    1 / -0

    B4C(boron carbide) is used except:

    Solution

    The correct answer is Option D.
    Boron carbide B4C is not used for making diborane.
    It is used in the extraction of boron, as an abrasive for polishing and for making bullet proof clothing.
     

  • Question 20
    1 / -0

    Froath floatation process is based on:

    Solution

    The correct is Option A.

    Froth flotation is a process of  concentration. Froth floatation process is suitable for sulphide ores. It is based on the difference in wetting properties of the ore and gangue with water and oil. This method is used for the concentration of FeCr2O4 

  • Question 21
    1 / -0

    When ZnS and PbS minerals are present together, then NaCN is added to separate them in the froth floatation process as a depressant, because

    Solution

    PbS + NaCN/KCN → No. reaction
    ZnS + NaCN/KCN → [Zn(CN)4]2– + S2– + 4Na+/ 4K+

  • Question 22
    1 / -0

    When copper is purified by electrorefining process, noble metals like Ag and Au are found in

    Solution

    Cu and Ag are found in anode mud.

  • Question 23
    1 / -0

    Formation of Ni(CO)4 and subsequent its decomposition into Ni and CO (recycled) makes basis of Mond's process

    Ni + 4CO  Ni (CO)4   Ni + 4CO

    T1 and T2 are :

    Solution

    Ni + 4CO  Ni (CO)4   Ni + 4CO
    T1 = 50ºC
    T2 = 230ºC

  • Question 24
    1 / -0

    Match column–I (process) with column–II (electrolyte) :

    Choose the correct alternate.

    Solution

    Down cell → Fused (40 % NaCl + 60 % CaCl2)
    Dow seawater process → fused NaCl2
    Hall-heroult ⇒ fused (Al2O3 + Na3AlF6 + CaF2)
    Moissan → Fused KHF2

  • Question 25
    1 / -0

    (I) FeCr2O4 + NaOH + air → (A) + Fe2O3

    (II) (A) + (B) → Na2Cr2O7

    (III) Na2Cr2O7 + X  Cr2O3

    (IV) Cr2O3 + Y  Cr

    Q.

    Compounds (A) and (B) are :

    Solution

    A → Na2CrO4
    B → H2SO4

  • Question 26
    1 / -0

    (I) FeCr2O4 + NaOH + air → (A) + Fe2O3

    (II) (A) + (B) → Na2Cr2O7

    (III) Na2Cr2O7 + X  Cr2O3

    (IV) Cr2O3 + Y  Cr

    Q.

    (X) and (Y) are :

    Solution

    X → CO
    Y → Al

  • Question 27
    1 / -0

    (I) FeCr2O4 + NaOH + air → (A) + Fe2O3

    (II) (A) + (B) → Na2Cr2O7

    (III) Na2Cr2O7 + X  Cr2O3

    (IV) Cr2O3 + Y  Cr

    Q.

    Na2CrO4 and Fe2O3 are separated by :

  • Question 28
    1 / -0

    (I) FeCr2O4 + NaOH + air → (A) + Fe2O3

    (II) (A) + (B) → Na2Cr2O7

    (III) Na2Cr2O7 + X  Cr2O3

    (IV) Cr2O3 + Y  Cr

    Q.

    High temperature (> 1000ºC) electrolytic reduction is necessary for isolating :

    Solution

    The correct answer is option A.
    Chromite ore is heated with sodium hydroxide in air to obtain sodium chromate. It is then heated with carbon to obtain chromium trioxide. It is then heated with aluminum to form chromium. This is reduction of chromium trioxide to chromium.

  • Question 29
    1 / -0

    In froth-floatation process, palm oil functions as :

    Solution

    Palm oil function as frother. It decreases the surface tension of the total solution, by which the formation of froth becomes easier.

  • Question 30
    1 / -0

    Collector are the substances which help in attachement of an ore particle to air bubble in froth. A popular collector used industrially is :

    Solution

    The correct answer is option A.
    Sodium ethyl xanthate is used as a collector in the froth floatation process.
    Froth floatation process used for the concentration of sulphide ore uses sodium ethyl xanthate, C2H5OCS2Na as collector.
    Other examples of collector include ethyl xanthate and potassium ethyl xanthate. They attach themselves to the grains of minerals by polar groups so that minerals become water repellent and pass on into the froth.

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