Question

water and mercury are filled in two test tube which liquid undergoes capillary depression​

Answer 1

Explanation:

Liquids that rise in small-bore tubes inserted into the liquid are said to wet the tube, whereas liquids that are depressed within thin tubes below the surface of the surrounding liquid do not wet the tube. Water is a liquid that wets glass capillary tubes; mercury is one that does not.

Answer 2

Mercury undergoes capillary depression​ in the test tube.

What is capillary depression?

• Depression in the meniscus of the liquid when filled n a narrow tube.
• Liquids showing capillary depression do not wet the walls of the tube.

Reason for capillary depression:

• Capillary depression occurs when the force of cohesion between liquid molecules is much greater than the adhesive force between the glass and the liquid.

• Cohesive forces- Force of attraction between molecules of same kind.

        eg: Forces operating between molecules of mercury.

• Adhesive forces-Force of attraction between molecules of different kind.

       eg: Forces operating between mercury and glass tube.

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