Question:

Position of non polar & polar part in miscell

Updated On: Apr 29, 2024
  • Polar at outer surface but non polar at innersurface
  • Polar at inner surface non polar at outer surface
  • Distributed over all the surface
  • Are present in the surface only
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The Correct Option is A

Solution and Explanation

The correct option is (A) : Polar at outer surface but non polar at inner surface.

An assembly of surfactant molecules scattered in a liquid colloid is known as a micelle. Polar head groups,which typically make up the micelle's exterior surface, are present in micelles. Because they are polar, they face the ocean. Since they are non-polar, the hydrophobic tails are within and away from the water.

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Concepts Used:

Classification of Colloids

Based on the Nature of Interaction Between Dispersed Phase and Dispersion Medium:

  • Hydrophilic colloids: These are water-loving colloids. The colloid particles are attracted to the water. They are also known as reversible sols. Examples include Agar, gelatin, pectin, etc
  • Hydrophobic colloids: These are the opposite in nature to hydrophilic colloids. The colloid particles are repelled by water. They are also called irreversible sols. Examples include Gold sols, clay particles, etc

Based on Type of Particles of Dispersed Phase:

  • Multimolecular Colloids: A large number of smaller molecules of a substance add on together on mixing and form species that are in the colloidal range. 
  • Macromolecular Colloids: In this colloid, the macromolecule forms a solution with a solvent. The size of particles remains in the range of colloidal particle size. Here, the colloidal particles are macromolecules having a very large molecular mass. 
  • Associated Colloids: Few substances react as strong electrolytes when they are in low concentration, but act as colloidal sols when they are in high concentration. In high concentration, particles aggregate and show colloidal behaviour and these particles are known as the micelles. They are also known as associated colloids. The formation of micelles occurs above a certain temperature and specific concentration. These colloids can be reverted by diluting it.