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Isolation of Elements Test - 2

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Isolation of Elements Test - 2
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  • Question 1
    4 / -1

     

    Which represents the correct abundance order of elements in the earth crust?

     

    Solution

     

     

    The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.3%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium 2.0%, and titanium 0.61%.

     

     

  • Question 2
    4 / -1

    Which of the following contains both copper and iron?

    Solution

    Chalcopyrite (CuFeS2) is the ore which contains both copper and iron.

  • Question 3
    4 / -1

    Regarding cryolite incorrect statement is

    Solution

    Cryolite (Na3AIF6) is used in the manufacture of aluminium. Electrolysis of (Al2O3) dissolved in molten Na3AIF6.

  • Question 4
    4 / -1

    In chromite ore, the oxidation number iron and chromium are respectively ______.

    Solution

    In chromite ore is (FeO . Cr2O3)
    Let the oxidation state of Fe be x.
    ∴ x - 2 + 2 x 3 + 3 x (-2) = 0
    x - 2 + 6 - 6 = 0 ⇒ x = + 2
    Let the oxidation state of Cr be y
    ∴ 2 y + 2 - 2 + 3 x (-2 ) = 0
    2 y - 6 = 0
    y = 3
    Hence, oxidation state of Fe and Cr are +2 and +3 respectively.

  • Question 5
    4 / -1

    Sulphide ores are common for metals

    Solution

    Metals having high polarising power (Zeff) exist in ore with anions having high polarisibility
    Ag, Cu, Pb →Sulphide ores (Ag2S, CuFeS2, Pbs)
    Sn → Oxide ore (SnO2)
    Mg→Sea water and dolomite (CaCO3, MgCO3)
    Al →Oxide ore (Al2O3.2H2O)

  • Question 6
    4 / -1

    Oxidation states of the metal in the minerals haematite and magnetite respectively are

    Solution

    Haematite is Fe2O3, in which oxidation number of iron is III. Magnetite is Fe3O4 which is infact a mixed oxide (FeO.Fe2O3), hence iron is present in both II and III oxidation state.

  • Question 7
    4 / -1

    Among the following statements the incorrect one is

    Solution

    Statement: Zinc blende and iron pyrites are sulphides. This statement is correct because zinc blende is ZnS and iron pyrites is FeS2.
    Statement:Calamine and siderite are carbonates. This statement is correct because calamine is ZnCO3 and siderite is FeCO3. 
    Statement: Malachite and azurite are ores of copper. This statement is also correct because malachite is Cu(OH)2.CuCO3 and azurite isCu(OH)2.2CuCO3. 
    Statement: Argentite and cuprite are oxides. This statement is incorrect because argentite is Ag2S and cuprite is Cu2O.

  • Question 8
    4 / -1

    A mineral is called an ore if

    Solution

    A mineral is called an ore if a metal can be profiteably extracted from it. e.g. Aluminium occur in earth's crust in the form of two minerals i.e. bauxite (Al2O3 . 2H2O) and clay (Al2O3 . 2SiO2 . 2H2O). Out of these two minerals aluminium can be conveniently and economically extracted from bauxite while no easy and cheap method is so far available for the extraction of aluminium from clay. Therefore, the ore of aluminium is bauxite.

  • Question 9
    4 / -1

    Which is incorrect match?

    Solution

    Siderite is a mineral composed of iron(II) carbonate (FeCO3)

  • Question 10
    4 / -1

    The molecular formula of Glauber's salt is:

    Solution

    Glauber's salt, common name for sodium sulfate decahydrate, Na2SO4.10H2O. It occurs as white or colorless monoclinic crystals. Upon exposure to fairly dry air, it effloresces, forming powdery anhydrous sodium sulfate.

  • Question 11
    4 / -1

     

    Which of the following is the correct combination?

     

    Solution

     

     

    Sodium nitrate is the chemical compound with the formula NaNO3. This alkali metal nitrate salt is also known as Chile saltpeter (large deposits of which were historically mined in Chile) to distinguish it from ordinary saltpeter, potassium nitrate. The mineral form is also known as nitratine, nitratite or soda niter.

     

     

  • Question 12
    4 / -1

     

    The earthy impurities present in the mineral are called:

     

    Solution

     

     

    Impurities like sand, mud, etc. are earthy impurities and are called gangue.

     

     

  • Question 13
    4 / -1

     

    Which is not the name of a mineral?

     

    Solution

     

     

    Plaster of Paris  is obtain ed by heating gypsum (CuSO4 . 2H2O) litharge is lead (II) oxide (PbO). Both of these are not mineral.

     

     

  • Question 14
    4 / -1

     

    Method used for the concentration of sulphide ore is :

    Solution

     

     

    Froth floatation method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil. It is used for selectively separating hydrophobic material from hydrophilic. This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores are preferably wetted by the oil and the gangue with water. Hence, this method is suitable for the concentration of the sulphide ore.

     

     

  • Question 15
    4 / -1

     

    Which is not an example of ore?

     

    Solution

     

     

    Ruby silver = Pyrargyrite(3Ag2S.Sb2S3 or Ag3SbS3),
    Horn silver = AgCI
    German silver = An alloy of Cu + Zn + Ni and Quick silver = Mercury.

     

     

  • Question 16
    4 / -1

    Comprehension Type

    This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)
                                                                               Passage

    The natural substances in which metals occur in the earth are called minerals. A mineral has a definite composition. It may be a single compound or a complex mixture . It is usually associated with number of impurities. The minerals from which the metals can be conveniently extracted are called ores .Thus, all ores are minerals but all minerals are not ores. Depending on the composition ores are classified into different types such as oxides, sulphides, carbonates, halides, silicates etc.

    Q. The impurities associated with minerals are called.

    Solution

    The correct answer is option A
    The impurities associated with minerals used in metallurgy are collectively called Gangue.

  • Question 17
    4 / -1

    The natural substances in which metals occur in the earth are called minerals. A mineral has a definite composition. It may be a single compound or a complex mixture . It is usually associated with number of impurities. The minerals from which the metals can be conveniently extracted are called ores .Thus, all ores are minerals but all minerals are not ores. Depending on the composition ores are classified into different types such as oxides, sulphides, carbonates, halides, silicates etc.

    Q. 

    Metals that exist in their native state are

    Solution

    Elements which are not attached by moisture, oxygen and carbon dioxide of the air occur in the native state, e.g. Au, Pt, and noble gases.

  • Question 18
    4 / -1

    Matching List Type

    Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q.

    Match the Column I with Column II and mark the correct options from the codes given below

    Solution

    (i) → (t), (ii) → (s), (iii) → (q), (iv) → (p)

  • Question 19
    4 / -1

     Match the Column I with Column II and mark the correct option from the codes given below.

    Solution

    (i) → (r), (ii) → (s), (iii) → (p), (iv) → (q,t)

  • Question 20
    4 / -1

     

    Froth flotation method cannot be employed for the concentration of:

     

    Solution

     

     

    Pyrolusite (MnO2) is an oxide ore, while zinc blende (ZnS), copper pyrites (CuFeS2) and cinnabar (HgS) are sulphide ores. Only sulphide ores are purified by froth flotatlon.

    Hence, froth flotation method cannot be employed for the concentration of pyrolusite.

    Option B is correct.

     

     

  • Question 21
    4 / -1

     

    The mass of carbon anode consumed (giving the only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is:

    [Atomic mass : Al = 27]

    Solution

     

     

     

     

  • Question 22
    4 / -1

     

    The method of zone refining of metals is based on the principle of:

     

  • Question 23
    4 / -1

     

    The main function of frothers is to _________________.

     

    Solution

     

     

    In the froth floatation process, oil is used as a frothing agent, also called as frothers. It reduces surface tension and helps to stablise froth. So, the main task of frothers is to stick to the ore and then take it to the top.

     

     

  • Question 24
    4 / -1

     

    Concentration of which of the following ore is carried out by froth floatation process?

     

    Solution

     

     

    Froth flotation process is selectively used for separating hydrophobic and hydrophilic substances.  Chalcocite (Cu2​S) is a sulphide ore and sulphide ores are concentrated by froth floatation.

     

     

  • Question 25
    4 / -1

    Statement Type

    This section is based on Statement I and Statement II. Select the correct anser from the codes given below.

    Q. 

    Statement I : The copper pyrite (CuFeS2) is the ore of copper.

    Statement II : The clay (Al2O3 . 2SiO2 . 2H2O) is the ore of aluminium.

    Solution

    Aluminium cannot be extracted from clay profitably.

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