Question
Download Solution PDFIn the case of liquids that do not wet the walls of the vessel
This question was previously asked in
Bihar STET TGT (Science) Official Paper-I (Held On: 08 Sept, 2023 Shift 1)
Answer (Detailed Solution Below)
Option 2 : Cohesive forces are larger than adhesive forces.
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Bihar STET Paper 1 Mathematics Full Test 1
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Detailed Solution
Download Solution PDFThe 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.
Last updated on Jan 29, 2025
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