CBSE  /  Class 12  /  Chemistry  /  General Principles and Processes of Isolation of Elements

  • 1. 
    Concentration of sulphide ore is done by

  • froth flotation process
  • electrolysis
  • roasting
  • None of these

  • 2. 
    Malachite is an ore of

  • iron
  • copper
  • zinc
  • Sliver

  • 3. 
    Ore of aluminium is

  • bauxite
  • hematite
  • dolomite
  • None of these

  • 4. 
    Removal of the unwanted materials like sand, clays, etc. from the ore is known as ………., …….. or ……….

  • concentration, dressing, benefaction
  • separation, refining, gangue
  • magnetic separation, purification, gangue
  • washing, refining, amalgamation

  • 5. 
    For which of the following ores froth floatation method is used for concentration?

  • Haematite
  • Zinc blende
  • Magnetite
  • Camallite

  • 6. 
    The powdered ore is agitated with water or washed with running stream of water. The heavy ore particles and lighter impurities are separated. This method of concentration is known as

  • metallurgy
  • leaching
  • froth floatation process
  • gravity separation

  • 7. 
    The oil used as frothing agent in froth floatation process is

  • coconut oil
  • castor oil
  • palmitic oil
  • pine oil

  • 8. 
    Which of the following metals is not extracted by leaching?

  • Aluminium
  • Mercury
  • Silver
  • Gold

  • 9. 
    Sulphide ore of zinc/copper is concentrated by

  • floatation process
  • electromagnetic process
  • gravity separation
  • distillation

  • 10. 
    Which of the following ores is concentrated by chemical leaching method?

  • Cinnabar
  • Argentite
  • Copper pyrites
  • Galena
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