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When a capillary tube is dipped into water then it rises up to some height. Then the surface of the water at top in the tube is-

When a capillary tube is dipped into water then it rises up to some height. Then the surface of the water at top in the tube is- Correct Answer Concave

CONCEPT:

  • Contact angle: The contact angle is a measure of the ability of a liquid to wet the surface of a solid. 
  • Adhesive forces: Attractive forces between molecules of different types are called adhesive forces.
  • Cohesive forces: Attractive forces between molecules of the same types are called cohesive forces.
  • For contact angle 90° the cohesive forces and adhesive forces are in the equilibrium state.

EXPLANATION:

  • Here the adhesive force between the water molecules and the tube surface is more than that of cohesive force. So surface is concave at the top as shown in the above figure. So option 2 is correct.

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  • When we will dip the tube in mercury then the cohesive force will be greater than adhesive force then the surface will be convex.

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