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Isolation of Elements Test - 7

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Isolation of Elements Test - 7
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  • Question 1
    4 / -1

     

    Poling process is used

     

    Solution

     

    Poling (metallurgy) is a method employed in the purification of copper which contains cuprous oxide as an impurity.

     

  • Question 2
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    In the electrolytic refining of zinc

    Solution

    In this method, the impure metal is converted into a block which forms the anode while cathode is made up of a pure strip of the same metal. These electrodes are suspended in an electrolyte which is the solution of a soluble salt of the metal usually double salt of the metal.

  • Question 3
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    The super pure silicon can be obtained by 

    Solution

    Zone refining This method is employed for preparing extremely pure metals. Germanium, silicon, boron, gallium and indium are purified by this method.
    This method is based upon the principle that when a molten solution of the impure metal is allowed to cool the pure metal crystallises out while the impurities remain in the melt.

  • Question 4
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    Purification of aluminium is called 

    Solution

    The Hoope's process is a metallurgical process used to obtain the aluminium metal of very high purity. It gives about 99.99% pure aluminium.

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

    Solution

    Cupellation This method is applied when the impure metal contains impurities of other metals which form volatile oxides. Distillation process This method is employed for purification of volatile metals like zinc, mercury, cadmium etc. The impure metal is heated in an iron retort and the vapours are condensed in separate receivers.

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

    Solution

    van Arkel method This method is used for preparation of ultra pure metals such as titanium and zirconium which are used in space technology. In this method, zirconium is heated in iodine vapours at about 870 K to form unstable volatile zirconium tetraiodide which when heated over a tungsten filament at 2075 K decompose to give pure zirconium.

  • Question 7
    4 / -1

    The most electropositive metals are extracted from their ores by

    Solution

    The extraction of highly electropositive metals is carried out by electrolysis of their oxides, hydroxides etc., in fused state because their compounds are not reduced by ordinary reducing agents.

  • Question 8
    4 / -1

    Which method of purification is represented by the following equation?

    Solution

    van Arkel method This method is used in the production of ultra-pure titanium and zirconium. It primarily involves the formation of the metal iodides and their subsequent decompositon to yield pure metal.

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

    Solution

    Since Mg is highly electropositive its extractive metallurgy is carried out by fused salt electrolysis.

  • Question 10
    4 / -1

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

    Solution

    The process takes place are under.

    The net result is the transfer of pure metal from the anode to the cathode,

  • Question 11
    4 / -1

     

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

     

    Solution

     

    The nitrate of AgNO3 leaves metallic globule on strongly heating.

  • Question 12
    4 / -1

     

    In the extraction of gold, the cyanide solution acts as a

     

    Solution

     

    When the gold pass in to the solution of sodium or potassium cyanide forming the respective soluble complex cyanides while the impurities remain unaffected which are filtered off.

     

  • Question 13
    4 / -1

     

    The matte is impure substance obtained during the extraction of

     

    Solution

     

    The suphide ores of copper are heated in reverberatory furnace. If the ore contains iron. It is mined with silica before heating. Iron oxide slags of as iron silicate and copper produced in the form of copper matte , which contain Cu2S and FeS.

     

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

     

    Solution

     

    Iron is produced by the following reaction.

    FeO + C → Fe + CO

  • 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

     

    Solution

     

    In the extraction of copper from its sulphide ore, when ore is subjected to roasting, some of it is oxidised to Cu2O which reacts with the remaining Cu2S (sulphide ore) to give copper metal.
    Cu2S +2Cu2O → 6Cu +SO2 ↑

    In this process, Cu2S behaves as reducing agent.

     

  • 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

    Solution

    The metal is obtained by thermal decomposition. Impure nickel is heated in a current of CO at 330-350 K. It forms volatile nickel carbonyl leaving behind the impurities.

  • Question 17
    4 / -1

    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.

    Solution

    Zone refining (Fractional crystallisation). This method is employed for preparing extremely pure metals, e.g. germanium, silicon, boron, gallium and indium.

  • Question 18
    4 / -1

    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.

    Solution

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

  • 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. 

    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

     

    Solution

     

  • Question 21
    4 / -1

     

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

     

    Solution

     

    The complex formed in the Mond process is (Ni(CO)4).
    Let the oxidation state of N be x.
    Therefore, x + 4 (0) = 0
    x = 0

     

  • Question 22
    4 / -1

     

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

     

    Solution

     

    Nickel is purified by Mond's process.

     

  • Question 23
    4 / -1

     

    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?

     

    Solution

     

     

  • Question 24
    4 / -1

     

    The percentage impurity in 23 carat gold is nearly

     

    Solution

     

     

    24 carat gold = 100% pure

    Hence, % impurity is nearly 4%.

     

     

  • Question 25
    4 / -1

     

    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.

     

    Solution

     

    Blister copper contains 0 - 2 % impurities.

     

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