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
Movement of dispersion medium under the influence of electric field is known as
  • electrodialysis
  • electrophoresis
  • electroosmosis
  • cataphoresis
Which of the following is not a method of removing impurities from a colloidal sol?
  • Electrodialysis
  • Ultrafiltration
  • Ultra centrifugation
  • Distillation
The substances which behave as colloidal solutions at higher concentration are called
  • associated colloids
  • multimolecular colloids
  • macromolecular colloids
  • protective colloids
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