In the case of liquids that do not wet the walls of the vessel 

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  1. Adhesive forces are larger than cohesive forces.
  2. Cohesive forces are larger than adhesive forces.
  3. Both adhesive and cohesive forces are equal in magnitude
  4. None of the above.

Answer (Detailed Solution Below)

Option 2 : Cohesive forces are larger than adhesive forces.
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Detailed Solution

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The correct answer is Cohesive forces are larger than adhesive forces.

Concept:

  • Cohesive forces
    • Cohesive forces are the forces of attraction between molecules of the same substance.
  • Adhesive forces
    • Adhesive forces are the forces of attraction between molecules of different substances such as glass and water.

Explanation:

  • Wetting refers to the ability of a liquid to spread across a surface, determined by the balance between adhesive and cohesive forces.
  • When a liquid does not wet the walls of a vessel, it suggests that the adhesive forces between the liquid and the surface (in this case, the vessel walls) are weaker than the cohesive forces between the liquid molecules i.e. cohesive forces are larger than adhesive forces. 
  • As a result, the liquid tends to form droplets or beads up on the surface rather than spreading out and forming a thin film. 

Thus, In the case of liquids that do not wet the walls of the vessel cohesive forces are larger than adhesive forces.

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