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Isolation of Elements Test - 3

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Isolation of Elements Test - 3
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  • Question 1
    4 / -1

     

    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
    4 / -1

     

    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.

    Hence the correct answer is A .

     

     

  • Question 3
    4 / -1

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

    Solution

  • Question 4
    4 / -1

    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
    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 6
    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 7
    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 8
    4 / -1

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

    X + Zn → Y + Au

    Solution


  • Question 9
    4 / -1

    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
    4 / -1

    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
    2Cu2S + 3O2 → 2Cu2O + 2SO2
    The SO2 produced is utilised for manufacturing H2SO4.

  • Question 11
    4 / -1

     

    The earthy impurities present in the mineral are called:

     

    Solution

     

     

    Impurities like sand, mud, etc. are earthy impurities and are called gangue.

     

     

  • Question 12
    4 / -1

     

    The final product in solvay process is:

     

    Solution

     

     

    The final product obtained in Solvay process (also known as ammonia soda process) is Na2​CO3​⋅10H2​O.

     

  • Question 13
    4 / -1

     

    Method used for the concentration of sulphide ore is :

     

    Solution

     

    Froth floatation method is based on the principle of the difference in the wetting properties of the ore and the gangue particles with the water and oil. It is used for selectively separating hydrophobic material from hydrophilic. This method is used for that metals whose ore gets preferably wetted by the oil and the gangue by the water. The sulphide ores are preferably wetted by the oil and the gangue with water. Hence, this method is suitable for the concentration of the sulphide ore.

     

     

  • Question 14
    4 / -1

     

    The extraction of metal from the ore is:

     

    Solution

     

     

    Extraction of metal from the ore is a reduction process as in this process, metal ion gets reduced to metals.

    Extraction of iron from ore haematite: 

    Option B is correct

     

  • Question 15
    4 / -1

     

    The collecting agent in froth floatation process is:

     

    Solution

     

    Collectors either chemically bond (chemisorption) on a hydrophobic mineral surface, or adsorb onto the surface through physisorption. Collectors increase the natural hydrophobicity of the surface, increasing the separability of the hydrophobic and hydrophilic particles. The collecting agent in froth floatation process is sodium ethyl xanthate.

    Pine oil is also added in froth floatation but as frother.

    Hence, the correct option is A.

     

     

  • Question 16
    4 / -1

    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

    Solution

    Copper pyrites is CuFeS2. Copper can be extracted from this by roasting of sulphide partially and reduction.

  • Question 17
    4 / -1

    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

    Solution

    Carbon (coal or coke) reduces the metal oxide to the free metal, e.g.

    The carbon monoxide obtained by the incomplete combustion of carbon can also bring about the reduction of metal oxides to free metal. e.g.

  • Question 18
    4 / -1

    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.

    Solution

    (i) → (q), (ii) → (s), (iii) → (r), (iv) → (p)
    Low electropositive metal oxides like Fe2O3 and ZnO can be reduced by CO. Cr2O3 cannot be reduced by CO or C because of their high melting point, some metal sulphides self reduced during roasting like CU2S, PbS and HgS.

  • Question 19
    4 / -1

    Match the Column I with Column II and mark the correct option from the codes given below.

    Solution

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

  • Question 20
    4 / -1

     

    Liquation process is used for the concentration of which ore?

     

    Solution

     

    Stibnite (antimonite) is a sulfide mineral with the formula Sb2​S3​. It is concentrated by liquation process.

    It was formerly used for extracting antimony minerals from ore.

    Separating silver from copper with the use of lead as a solvent, and refining tin. 

    Option A is correct.

     

     

  • Question 21
    4 / -1

     

    100% copper is obtained from crude copper by :

     

    Solution

     

    In electrorefining step, impurities like Fe, Ni, Zn get dissolved in the solution while Au, Ag and Pt are deposited as anode mud below the anode and 100% copper is obtained from crude copper.

     

     

  • Question 22
    4 / -1

     

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

     

    Solution

     

    Liquation process is used for the purification of the metal, which itself is readily fusible, but the impurities present in it are not, used for the purification of Sn and Zn, and for removing Pb from Zn-Ag alloy.

     

     

  • Question 23
    4 / -1

     

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

     

    Solution

     

     

     

  • Question 24
    4 / -1

     

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

     

    Solution

     

    Aluminium is obtained by the electrolysis of pure alumina (Al2​O3​) dissolved in cryolite (Na3​AlF6​) and fluorspar (CaF2​). Cryolite and fluorspar lower the melting point of the mixture and increase electrical conductivity.

     

     

  • Question 25
    4 / -1

    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.

    Solution

    Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
    In the extraction of silver, silver is extracted as anionic complex [Ag(CN)2],

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