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Isolation of Elements Test - 8

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Isolation of Elements Test - 8
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  • Question 1
    4 / -1

     

    In the electrolytic refining of zinc

     

    Solution

     

     

    Electrodes are suspended in an electrolyte which is the solution of a soluble salt of the metal usually a double salt of the metal.

     

     

  • Question 2
    4 / -1

    When compared to ΔG° for the formation of Al2O3 the ΔG° for the formation of Cr2O3 is

    Solution

    ΔG° is higher for the formation of Cr2O3.

  • Question 3
    4 / -1

    During the extraction of gold the following reactions take place

    Au + CN- + H2O  X,
    X + Zn → Y + Au

    Here, X and Y respectively are

    Solution

    4Au + 8KCN + O2 + 2H2O → 4K[Au(CN)2]
    [4Au(CN)2]- + Zn → [Zn(CN)4]2- + Au

  • Question 4
    4 / -1

    Gold is extracted by hydrometallurgical process based on its property

    Solution

    [Au(CN)2]- is water soluble complex.

  • Question 5
    4 / -1

    During Hoope’s process for electrolytic refining of Al, the middle layer is of

    Solution

    In the Hoope’s process the middle layer consists of cryolite and BaF2.

  • Question 6
    4 / -1

    Thermite is a mixture of iron oxide and 

    Solution

    Thermite is a mixture of metallic oxide (Say. FeO, Cr2O3, Mn3O4) etc. and aluminium powder.

  • Question 7
    4 / -1

    Which is an alloy of aluminium?

    Solution

    Magnalium consists of aluminium with from 5% to 30% mangesium. Duralumin is a light hard aluminium alloy containing about 4% copper and small amount of mangnesium.

  • Question 8
    4 / -1

    Which one of the following metals has the largest abundance in the earth’s crust?

    Solution

    Aluminium is the metal which has the largest abundance in the earth's crust.

  • Question 9
    4 / -1

    The processes used in the refining of aluminium and zinc metals respectively are

    Solution

    The processes used in the refining of aluminium and zinc metals are Hoope's process and fractional distillation.

  • Question 10
    4 / -1

    In sulphatizing roasting of ZnS products are

    Solution

    Due to incomplete roasting ZnSO4 is formed.

  • Question 11
    4 / -1

     

    Purification of alumina is called

     

    Solution

     

    The correct answer is Option A.
    The purification of alumina can be done by Baeyer's process.

    In Baeyer’s process, impure bauxite is converted into pure alumina. The conversion process involves mainly three reactions:

    1. Concentrated sodium hydroxide solution is heated with amphoteric bauxite at a temperature of 150 to 200°C under pressure to get sodium aluminate.
    2. Sodium aluminate is then diluted with water at a temperature of 50 to 60°C. Thus, sodium aluminate gets hydrolysed to form solid aluminium hydroxide and sodium hydroxide.
    3. Finally, dried aluminium hydroxide precipitate is ignited at a temperature of 1100°C to remove water molecules to get alumina.
     

  • Question 12
    4 / -1

     

    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 13
    4 / -1

     

    Bessemerization is carried out for

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

    Solution

     

    Bessermerisatioin process is used for Fe and Cu

  • Question 14
    4 / -1

     

    Which of the following is not used for obtaining Ag

     

  • Question 15
    4 / -1

     

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

     

    Solution

     

    Smelting is not a process of concn of ore.

  • Question 16
    4 / -1

    Comprehension Type

    Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    The chief ore of zinc is ZnS.The ore is purified by floatation process and then heated in air which converts ZnS into ZnO. ZnO can be reduced with coke in Belgian process to get zinc which is purified by electrolysis.
    Alternately zinc can be extracted from calamine .This after purification by levigation, subjected to calcination to get oxide. This on reduction by Belgian method followed by electrolytic refining yields pure zinc.

    Q. 

    Zinc oxide is converted into zinc by

    Solution

    Zinc oxide is converted into zinc by reduction with carbon.

  • Question 17
    4 / -1

    Passage

    The chief ore of zinc is ZnS.The ore is purified by floatation process and then heated in air which converts ZnS into ZnO. ZnO can be reduced with coke in Belgian process to get zinc which is purified by electrolysis.
    Alternately zinc can be extracted from calamine .This after purification by levigation, subjected to calcination to get oxide. This on reduction by Belgian method followed by electrolytic refining yields pure zinc.

    Q. 

    Which of the following graph in the given figure is the Ellingham diagram of ZnO?

    Solution

    The third graph is the correct Ellingham diagram of Zn.

  • Question 18
    4 / -1

    Matching List Type

    Direction (Q. Nos. 18 and 19) 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 option from the codes given below.

    Solution

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

  • Question 19
    4 / -1

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

    Solution

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

  • Question 20
    4 / -1

     

    One Integer Value Correct Type

    Direction (Q, Nos. 20-24) This section contains 5 questions. When worked out will result in an integer from 0 to 9 (both inclusive).

    Q. 

    Gibbsite formula is Al2O3 . xH2O. Here, value of x is

     

    Solution

     

    Gibbsite is AI2O3.3H2O.

     

  • Question 21
    4 / -1

     

    Gold is soluble in aqua-regia which is cone. HNO3 and cone. HCI in 1: x ratio. Then the value of x is

     

    Solution

     

    Gold dissolves in aq ua regia i.e. HNO3 and HCI (1:3) ratio.

     

  • Question 22
    4 / -1

     

    Duralumin is an important alloy of aluminium .This has 95% Al and ...... % copper.

     

    Solution

     

    Duralumin is Al 95%, Cu 4%, Mg 0.5% and Mn 0.5%.

     

  • Question 23
    4 / -1

     

    Al is amphoteric metal and liberate hydrogen by reacting with both with dilute acids and bases . 2 moles of Al metal when reacted with either acid or base, the number of moles of dihydrogen liberated is ......

     

    Solution

     

    2 moles of Al = 6 equivalents Ai.Therefore hydrogen produced is also 6 equivalents i.e. 6g = 3 moles.

     

  • Question 24
    4 / -1

     

    During the Hall-Heroult process of preparing Al metal from purified bauxite, if 3 moles of O2 is formed at anode the number of moles of Al formed at cathode is

     

    Solution

     

    6O2- → 3O2 + 12e- and 4AI3+ + 12e- → 4AI.
    This shows that for every 3 moles of oxygen 4 moles Al is formed.

     

  • Question 25
    4 / -1

    Statement Type

    Direction (Q. No. 25) This section is based,on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Statement I : Many gem stones are impure forms of alumina (Al2O3).

    Statement II : In cyanide process gold (Au) is treated with a cone, solution of sodium or potassium cyanide.

     

    Solution

     

     

    Many gem stones are impure forms of alumina (Al2O3) for e.g. The impurity present in ruby is Cr while sapphire contains Co as the impurity. In cyanide process dilute solution (0.5%)of sodium or potassium cyanide is used.

     

     

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