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Isolation of El...

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  • Question 1
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    Which represents the correct abundance order of elements in the earth crust?

     

  • Question 2
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    Which of the following contains both copper and iron?

  • Question 3
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    Regarding cryolite incorrect statement is

  • Question 4
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    In chromite ore, the oxidation number iron and chromium are respectively ______.

  • Question 5
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    Sulphide ores are common for metals

  • Question 6
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    Oxidation states of the metal in the minerals haematite and magnetite respectively are

  • Question 7
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    Among the following statements the incorrect one is

  • Question 8
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    A mineral is called an ore if

  • Question 9
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    Which is incorrect match?

  • Question 10
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    The molecular formula of Glauber's salt is:

  • Question 11
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    Which of the following is the correct combination?

     

  • Question 12
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    The earthy impurities present in the mineral are called:

     

  • Question 13
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    Which is not the name of a mineral?

     

  • Question 14
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    Method used for the concentration of sulphide ore is :

  • Question 15
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    Which is not an example of ore?

     

  • Question 16
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    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.

  • Question 17
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    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

  • Question 18
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    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

  • 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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    Froth flotation method cannot be employed for the concentration of:

     

  • Question 21
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    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]

  • Question 22
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    The method of zone refining of metals is based on the principle of:

     

  • Question 23
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    The main function of frothers is to _________________.

     

  • Question 24
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    Concentration of which of the following ore is carried out by froth floatation process?

     

  • Question 25
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    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.

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