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If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
- a)higher than the surface of liquid
- b)the same as the surface of liquid
- c)lower than the surface of liquid
- d)unpredictable
- e)none of the above
Correct answer is option 'C'. Can you explain this answer?
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Option (c)
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Explanation:
Cohesion:
- Cohesion refers to the attractive force between molecules of the same substance.
- In the case of a fluid, the molecules of the fluid are attracted to each other, resulting in surface tension.
Adhesion:
- Adhesion refers to the attractive force between molecules of different substances.
- In the case of a fluid and a glass surface, the molecules of the fluid are attracted to the glass surface, resulting in wetting.
Dipped Glass Tube:
- When a glass tube is dipped into a fluid, the fluid rises up the tube due to adhesion and surface tension.
- The level of the fluid in the tube is determined by the balance between cohesive forces within the fluid and adhesive forces between the fluid and the glass.
If Cohesion > Adhesion:
- This means that the cohesive forces within the fluid are stronger than the adhesive forces between the fluid and the glass.
- As a result, the fluid will tend to pull back from the glass surface and form a concave meniscus.
- The free level of fluid in the dipped glass tube will be lower than the surface of the liquid due to the concave meniscus.
Therefore, the correct answer is option 'C' - lower than the surface of the liquid.
Cohesion:
- Cohesion refers to the attractive force between molecules of the same substance.
- In the case of a fluid, the molecules of the fluid are attracted to each other, resulting in surface tension.
Adhesion:
- Adhesion refers to the attractive force between molecules of different substances.
- In the case of a fluid and a glass surface, the molecules of the fluid are attracted to the glass surface, resulting in wetting.
Dipped Glass Tube:
- When a glass tube is dipped into a fluid, the fluid rises up the tube due to adhesion and surface tension.
- The level of the fluid in the tube is determined by the balance between cohesive forces within the fluid and adhesive forces between the fluid and the glass.
If Cohesion > Adhesion:
- This means that the cohesive forces within the fluid are stronger than the adhesive forces between the fluid and the glass.
- As a result, the fluid will tend to pull back from the glass surface and form a concave meniscus.
- The free level of fluid in the dipped glass tube will be lower than the surface of the liquid due to the concave meniscus.
Therefore, the correct answer is option 'C' - lower than the surface of the liquid.
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Community Answer
If cohesion between molecules of a fluid is greater than adhesion betw...
It is a property of surface tension, that makes the free level of the fluid at lower level than that of surface of liquid. Here the force of contraction is much more that of force of repulsion.
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