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Isolation of El...

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  • Question 1
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    Which of the following is not correctly matched ?

     

  • Question 2
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    The purpose of adding cryolite is

     

  • Question 3
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    In Mac Arthur Forest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of

  • Question 4
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    In the extraction of copper, the metal formed in the Bessem er’s convertor is due to the reaction

  • Question 5
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    The nitrate of which metal leaves metallic globule on strongly heating ?

  • Question 6
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    In the extraction of gold, the cyanide solution acts as a

  • Question 7
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    The matte is impure substance obtained during the extraction of

  • Question 8
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    During the extraction of gold the following reactions takes place
      Au + CN- + H2O  X,

    X + Zn → Y + Au

  • Question 9
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    Identify the reaction that does not take place in a blast furnace

  • Question 10
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    Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as reducing agent and its acid is never isolated. The gas X is

  • Question 11
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    The earthy impurities present in the mineral are called:

     

  • Question 12
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    The final product in solvay process is:

     

  • Question 13
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    Method used for the concentration of sulphide ore is :

     

  • Question 14
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    The extraction of metal from the ore is:

     

  • Question 15
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    The collecting agent in froth floatation process is:

     

  • 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

    Copper is extracted from copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into silica lined convertor. Some silica is also added and a hot air blast is blown into the mixture to obtain blister copper which is purified by electro refining.

    Q. 

    The chemical formula of copper pyrites is

  • Question 17
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    Copper is extracted from copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into silica lined convertor. Some silica is also added and a hot air blast is blown into the mixture to obtain blister copper which is purified by electro refining.

    Q. 

    Coke is added during smelting

  • 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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    Liquation process is used for the concentration of which ore?

     

  • Question 21
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    100% copper is obtained from crude copper by :

     

  • Question 22
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    Liquation method is used to refine which of the following crude metal?

     

  • Question 23
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    Which one of the following is used in the extraction of aluminium by electrolytic process?

     

  • Question 24
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    Aluminium is obtained by the electrolysis of pure Al2O3, dissolved in:

     

  • 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 : Cast iron is obtained by remelting pig iron with scrap iron and coke wing hot air blast.
    Statement II : In the extraction of silver, silver is extracted as cationic complex.

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  • Unanswered - 25

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