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Isolation of El...

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  • Question 1
    4 / -1

     

    In the electrolytic refining of zinc

     

  • Question 2
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    When compared to ΔG° for the formation of Al2O3 the ΔG° for the formation of Cr2O3 is

  • Question 3
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    During the extraction of gold the following reactions take place

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

    Here, X and Y respectively are

  • Question 4
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    Gold is extracted by hydrometallurgical process based on its property

  • Question 5
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    During Hoope’s process for electrolytic refining of Al, the middle layer is of

  • Question 6
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    Thermite is a mixture of iron oxide and 

  • Question 7
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    Which is an alloy of aluminium?

  • Question 8
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    Which one of the following metals has the largest abundance in the earth’s crust?

  • Question 9
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    The processes used in the refining of aluminium and zinc metals respectively are

  • Question 10
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    In sulphatizing roasting of ZnS products are

  • Question 11
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    Purification of alumina is called

     

  • Question 12
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    Which of the following does not contain Mg :

     

  • Question 13
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    Bessemerization is carried out for

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

  • Question 14
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    Which of the following is not used for obtaining Ag

     

  • Question 15
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    Which one of the following is not a method of concentration of ore?

     

  • Question 16
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    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

  • Question 17
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    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?

  • Question 18
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    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.

  • Question 19
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    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 20
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    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

     

  • Question 21
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    Gold is soluble in aqua-regia which is cone. HNO3 and cone. HCI in 1: x ratio. Then the value of x is

     

  • Question 22
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    Duralumin is an important alloy of aluminium .This has 95% Al and ...... % copper.

     

  • Question 23
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    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 ......

     

  • Question 24
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    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

     

  • Question 25
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    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.

     

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