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If you are given five samples of a liquid having a fixed density, identify the increasing order of the heights the samples will reach in the following capillary tubes.
  • a)
    A B C D
  • b)
    D C B A
  • c)
    A D C B
  • d)
    C B D A
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If you are given five samples of a liquid having a fixed density, iden...
Capillarity
  • It is the phenomenon of rising or fall in liquid surface relative to the general adjacent level of the liquid, capillarity comes into existence, Because of cohesion and adhesion.
  • If cohesion is less than adhesion, then the capillary rise is observed. On the other hand, if cohesion is more than adhesion then capillary fall or depression is observed.
Capillary rise or fall is given by:
Also, some of the important terms involved in the capillary action are as follow
  • 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.
The below figure represents different shapes of mercury and water inside the capillary tube.

Where,
σ = surface tension, ρ = density of liquid, θ = angle of contact, d = diameter of the capillary tube
Capillary rise is given by the formula 


In the given figure, The diameter of the capillary is in increasing order D < C < B < A
Hence the order of the capillary rise will be A < B < C < D
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If you are given five samples of a liquid having a fixed density, identify the increasing order of the heights the samples will reach in the following capillary tubes.a)A B C Db)D C B Ac)A D C Bd)C B D ACorrect answer is option 'A'. Can you explain this answer?
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