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Isolation of El...

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  • Question 1
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    Poling process is used

     

  • Question 2
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    In the electrolytic refining of zinc

  • Question 3
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    The super pure silicon can be obtained by 

  • Question 4
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    Purification of aluminium is called 

  • Question 5
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    The processes used in the refining of aluminium and zinc metals respectively are

  • Question 6
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    van Arkel method of purification of metals involves converting the metal to

  • Question 7
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    The most electropositive metals are extracted from their ores by

  • Question 8
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    Which method of purification is represented by the following equation?

  • Question 9
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    Which of the following process is used in the extractive metallurgy of magnesium?

  • Question 10
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    In the electrolytic refining of copper using CuSO4 as electrolyte the anod reaction is 

  • Question 11
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    The nitrate of which metal leaves metallic globule on strongly heating ?

     

  • Question 12
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    In the extraction of gold, the cyanide solution acts as a

     

  • Question 13
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    The matte is impure substance obtained during the extraction of

     

  • Question 14
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    Identify the reaction that does not take place in a blast furnace

     

  • Question 15
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    In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

     

  • 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

    Impure metals are purified by different methods in order to remove the undesired impurities. These methods depend on the nature of metal and nature of impurities. Liquation is used for purifying metals with low melting points like Bi, Sn, Pb, Hg etc. Distillation is used for volatile metals like Zn, Cd, Hg. Cupellation is used to purify silver metal with lead impurities. Electrolytic refining (Cu, Ag, Mg, Al) Zone refining (Si, Ge, Ga) Mond’s process (Ni) van Arkel process (Zr, Ti).

    Q. 

    In the extraction of nickel by Mond’s process, the metal is obtained by

  • Question 17
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    Impure metals are purified by different methods in order to remove the undesired impurities. These methods depend on the nature of metal and nature of impurities. Liquation is used for purifying metals with low melting points like Bi, Sn, Pb, Hg etc. Distillation is used for volatile metals like Zn, Cd, Hg. Cupellation is used to purify silver metal with lead impurities. Electrolytic refining (Cu, Ag, Mg, Al) Zone refining (Si, Ge, Ga) Mond’s process (Ni) van Arkel process (Zr, Ti).

    Q. 

    Suggest a method of purification for obtaining highly pure solar grade silicon used as a semiconductor.

  • Question 18
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    Matching List Type

    Direction (Q. No. 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. 

    In auto reduction process of copper, the part of cuprous sulphide is oxidised with cuprous oxide to form a free copper metal. The balanced equation is as follows 

    Cu2S + 2Cu2O → xCu + SO2

    The value of x is

     

  • Question 21
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    The central atom in the stable volatile complex formed in the Mond’s method has the oxidation number

     

  • Question 22
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    Number of ligands in the stable volatile complex formed during the extraction of Ni by Mond’s process.

     

  • Question 23
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    Sea water contains 1297.3g of Mg2+ per metric ton. How much of slaked lime in kg, must be added to 1.0 metric ton of sea water to precipitate all of the Mg2+ ion?

     

  • Question 24
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    The percentage impurity in 23 carat gold is nearly

     

  • Question 25
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    This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

    Q. 

    Satement I : In electrorefining process cathode is made up of a pure strip of the same metal.

    Statement II : Blister copper contains 50% impurities.

     

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