CBSE  /  Class 12  /  Chemistry  /  Surface Chemistry

  • 1. 
    Which of the following is not a method for coagulation of lyophobic sols?

  • By electrophoresis
  • By mixing oppositely charged sols
  • By adding electrolyte
  • By adding a protective colloid

  • 2. 
    Why is alum added to water containing suspended impurities?

  • To make acolloidal solution
  • To coagulate the suspended impurities
  • To remove impurities of calcium and magnesium
  • To protect the colloidal solution from gening precipitated

  • 3. 
    Movement of dispersion medium under the influence of electric field is known as

  • electrodialysis
  • electrophoresis
  • electroosmosis
  • cataphoresis

  • 4. 
    Which of the following is not a method of removing impurities from a colloidal sol?

  • Electrodialysis
  • Ultrafiltration
  • Ultra centrifugation
  • Distillation

  • 5. 
    The substances which behave as colloidal solutions at higher concentration are called

  • associated colloids
  • multimolecular colloids
  • macromolecular colloids
  • protective colloids
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