Define cohesive and adhesive force....

Define cohesive and adhesive force.

Text Solution

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The forces of attraction between the molecules of the same substance are known as cohesive forces whereas adhsive forces are the forces which exist between the molecules of two different substances.
For example, water particles stick to the glass rod due to adhesive forces.

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F_c and F_A denote cohesive and adhesive forces on a liquid molecule near the surface of a solid. The surface of liquid is convex , if

`F_Agt(F_c)/(sqrt(2))`

`F_A=(F_c)/(sqrt(2))`

`F_Alt(F_c)/(sqrt(2))`

`F_AgtF_c`

Assertion : Cohesive and adhesive properties of water molecules form a continuous water column in the xylem. Reason : Magnitude of cohesive and adhesive force is very low.

Both the Assertion and Reason are true and Reason is the correct explanation of the Assertion.

Both Assertion and Reason are true, but Reason is not the correct explanation of assertion

Assertion is true, but Reason is false

Assertion is false, but Reason is true

Assertiion: Angle of contact does not depend upon the inclination of the solid in the liquid. Reason: Angle of contact depends on cohesive and adhesive force.

If both Assertion & Reason are true & the Reason is a correct explanation of the Assertion.

If both Assertion & Reason are true & the reason is not a correct explanation of the Assertion.

If Assertioin is true but the Reason is false.

If both Assertion and Reason are false.