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General Principles and Processes of Isolation of Elements-Important Questions & Preparation Tips

Sep 19, 2013 18:44 IST

    In this article you will get the clue that from where and how the questions are being framed from the chapter General Principles and Processes of Isolation of Elements. The experts of jagranjosh.com have full confidence that you will not miss any of the questions in the board exam as well as in competitive exams from this chapter if you will keep the following terms / question in your mind while studying.

    • What are general principles common to all metallurgical process?
    • Define:

              a) Ores

              b) Metallurgy

              c) Calcinations

              d) Roasting

              e) Ellingham Diagram

              f)  Liquation

              g) Distillation

              h) Slag

              i)  Anode mud

    • Explain the leaching of alumina?
    • Detail study of froth floatation process with proper steps?
    • Differentiate between roasting and calcinations?
    • What criteria involved in the prediction of an element to act as a reducing agent?
    • List the thermodynamic principles of metallurgy?
    • Short note on Ellingham diagram? Also list its limitations.
    • The most important role of a reducing agent
    • Explain the reactions occurring in the blast furnace?
    • The importance of Coke in most reactions
    • Is it possible that Mg to reduce SiO2 or Si to reduce MgO? Explain.
    • What is the role of flux in reduction of metal ions in solution?
    •  Explain the HallHéroult process?
    • Is it possible to extract copper from used up copper ores? Give reason.
    • Explain in short the Mond process?
    • Explain:

              a) Zone refining

              b) Vapor phase refining

              c) Chromatographic methods

    • Explain Column Chromatography with an example?
    • Differentiate between cast iron and pig iron?
    • Why is zinc used as a galvanizing agent instead of aluminum?
    • Differentiate between fractional distillation and distillation?
    • Explain the Van Arkel Method?
    • List the steps for the extraction of gold?
    • Nitriding process with reaction
    • Name the compound used in the inner lining of blast furnace
    • Short note on electro refining and also mention the nature of anode, cathode and electrolyte
    • Name the process to purify the native ores
    • What is blister copper
    • Some sample questions from this chapter are given below

    1. Write the proper steps for the extraction and isolation of metals from ores:

        I. Isolation of the metal from its concentrated ore

        II. Purification of the metal, and

        III. Concentration of the ore.

    a) I-II-III

    b) III-II-I

    c) III-I-II

    d) II-I-III

    To get the CBSE class 12th GUESS PAPERS, Click Here

    2. Calamine is ore of which metal:

    a) Aluminum

    b) Iron

    c) Copper

    d) Zinc

    To get the CBSE class 12th PRACTICE PAPERS, Click Here

    3. Which is the most abundant metal in the Earth’s crust?

    a) Aluminum

    b) Iron

    c) Chromium

    d) Silver

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    4. Which method is used for the separation of lighter gangue particles:

    a) Froth Floatation Process

    b) Hydraulic Washing

    c) Magnetic Separation

    d) Leaching

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    5. Why are depressants used in the froth floatation method:

    a) Recovery of ore particles,

    b) Separate two sulphide ores,

    c) Stabilize the froth, and

    d) Enhance non-wet ability.

    To get the CBSE class 12th NCERT SOLUTIONS, Click Here

    6. What is the depressant used in PbS?

    7. What is the criterion involved behind the separation of impurities from ore in the froth floatation process?

    8. What is the role of potassium ethyl xanthate in the froth floatation process?

    9. Name the method to purify the semiconductors?

    10. Read the given statements carefully:

    a) Concentrated ore at high temperature (below melting point) in absence of air.

    b) Concentrated ore at high temperature (below melting point) in presence of air.

    c) Process used to make the Carbonate ores into porous form.

    d) Process used to make the Sulphide ores into simplest oxide form.

    Choose the correct statement for Calcinations:

    a) b and d

    b) b and c

    c) a and c

    d) a and d

    Choose the correct statement for Roasting:

    e) b and d

    f) b and c

    g) a and c

    h) a and d

    11. Write the chemical formulae for the given ores:

    a) Cassitirite

    b) Bauxite

    c) Argentite

    d) Heavy Spar

    e) Calamine

    f) Dolomite

    g) Cinnabar

    h) Epsom

    i) Glauber Salt

    j) Bordeaux Mixture

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