General Principles & Processes Of Isolation Of Elements

15 Questions | Total Attempts: 511

SettingsSettingsSettings
Please wait...
General Principles & Processes Of Isolation Of Elements

Time: 30 Minute


Questions and Answers
  • 1. 
    The most abundant metal in the earth’s crust is:
    • A. 

      Sodium

    • B. 

      Calcium

    • C. 

      Aluminum

    • D. 

      Iron

  • 2. 
    Name the process in which, an upward stream of running water is used to wash the powdered ore:
    • A. 

      Magnetic Separation

    • B. 

      Gravity Separation

    • C. 

      Froth Floatation Process

    • D. 

      Calcinations

  • 3. 
    The function of pine oil in Froth Floatation Process is to:
    • A. 

      Stabilise the froth formed.

    • B. 

      Separate two sulphide ores

    • C. 

      Recover the ore particles.

    • D. 

      Enhance non-wettability of the mineral particles

  • 4. 
    ______ is an ore of aluminum:
    • A. 

      Sand

    • B. 

      Clay

    • C. 

      Haematite

    • D. 

      Zincite

  • 5. 
    Which of the following contains both Ca and Mg:
    • A. 

      Limestone

    • B. 

      Dolomite

    • C. 

      Chalk

    • D. 

      Feldspar

  • 6. 
    Drying agent who react with CO2 and removes water vapours is:
    • A. 

      CaO

    • B. 
    • C. 
    • D. 
  • 7. 
    The slag is formed by:
    • A. 

      Gangue particles

    • B. 

      Main ore

    • C. 

      Ore and Gangue particles

    • D. 

      None of the above

  • 8. 
    ______ is used to make interpretations and predict which element will suit as the reducing agent for a given metal oxide:
    • A. 

      Enthalpy

    • B. 

      Entropy

    • C. 

      Gibb’s Energy

    • D. 

      Specific Heat

  • 9. 
    Refining process is used in:
    • A. 
    • B. 
    • C. 
    • D. 

      In all the above

  • 10. 
    Highly electropositive metals cannot be extracted by carbon reduction process, because these:
    • A. 

      Metals combine with carbon to form carbide

    • B. 

      Metals do not react with carbon

    • C. 

      Metal oxides are not reduced by carbon

    • D. 

      Metals are not reduced by

  • 11. 
    Which metal cannot be obtained by electrolysis of their aqueous solution:
    • A. 

      Ag

    • B. 

      Mg

    • C. 

      Cu

    • D. 

      Pt

  • 12. 
    Froth Floatation method may be used to increase the concentration of mineral in:
    • A. 

      Chalcophyrite

    • B. 

      Bauxite

    • C. 

      Haematite

    • D. 

      Calamine

  • 13. 
    Which of the following can be used to give above 3000 temperature:
    • A. 

      Blast furnace

    • B. 

      Arc furnace

    • C. 

      Muffle furnace

    • D. 

      Reverberatory furnace

  • 14. 
    Predict the method which is based on the principle of difference in melting point of the metal and the impurities:
    • A. 

      Zone refining

    • B. 

      Electrolytic refining

    • C. 

      Liquation

    • D. 

      Distillation

  • 15. 
    Mg can reduce SiO2 to Si, when:
    • A. 

      Gibb’s energy remains constant

    • B. 

      Enthalpy remains constant.

    • C. 

      Temperature is less than ΔH / ΔS

    • D. 

      Temperature is greater than ΔH / ΔS

Related Topics
Back to Top Back to top