The correct option among the following is:

  • A
    Colloidal particles in lyophobic sols can be precipitated by electrophoresis.
  • B
    Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
  • C
    Colloidal medicines are more effective because they have small surface area.
  • D
    Addition of alum to water makes it unfit for drinking.

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