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Principles & Isolation of Elements Test - 10

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Principles & Isolation of Elements Test - 10
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  • Question 1
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    Only One Option Correct Type

    Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

    Q.

    Which of the following is not correctly matched ?

    Solution

    Cyanide process The extraction of gold from its ores by dissolving the gold in a solution of potassium cyanide, KCN. The resulting potassium aurocyanide, KAu(CN)2 , with zinc, filtering off, melting down and cupelling the metal.

  • Question 2
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    The purpose of adding cryolite is

     

    Solution

     

     

    Cryolite is used in the electrolysis of aluminium oxide. The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.

    Fluorspar is added along with cryolite as electrolytes with Gibbsite fluorspar is responsible for increasing the conductivity as well as the fluidity of Al whereas cryolite lowers the melting point of Al2O3

    Hence the correct answers are A and B.

     

     

  • 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

    Solution

  • 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

    Solution

    Some times the sulphide ore may be oxidised to sulphate which is then reduced to the free metal by the excess of the sulphide ore.

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

    Solution

    The nitrate of AgNO3 leaves metallic globule on strongly heating.

  • Question 6
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    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 7
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    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 Cu2 S and FeS.

  • Question 8
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    During the extraction of gold the following reactions takes place
      Au + CN-  + H2 O   X,

    X + Zn  →Y + Au

    Solution


  • Question 9
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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 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

    Solution

    The reactions involve in roasting process.
    2ZnS + 3O2 →2ZnO + 2SO2
    2PbS + 3O2 →2PbO + 2SO2
    2Cu2 S + 3O2 →2Cu2 O  + 2SO2
    The SO2 produced is utilised for manufacturing H2 SO4 .

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