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Eduncle posted an MCQ
October 20, 2019 • 16:13 pm 0 points
  • CSIR NET
  • Chemical Sciences

The stability of lyophobic colloids is a consequence of the

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    Eduncle Best Answer

    The dispersed phase in a lyophobic colloid is stabilised as a result of the formation of electrical layer between two phases. 
    The electrical properties of colloids can also be explained by electrical double layer theory. According to this theory a double layer of ions appear at the surface of solid.
    The ion preferentially adsorbed is held in fixed part and imparts charge to colloidal particles.The second part consists of a diffuse mobile layer of ions.
    This second layer consists of both the type of charges. The net charge on the second layer is exactly equal to that on the fixed part.The existence of opposite sign on fixed and diffuse parts of double layer leads to appearance of a difference of potential, known as zeta potential or electrokinetic potential. Now when electric field is employed the particles move (electrophoresis)

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