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Surface Tension

For a liquid ...

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For a liquid and glass interface , if adhesive force is greater than cohesive force , then the angle of contact is 1) greater than 90 2)equal to 90 3)less than 90 4) both 1 and

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Q. Assertion (A): The angle of contact of pure water with glass is acute.
Reason (R): The adhesive force between molecules of water and glass is greater than cohesive force between water molecules.

Q. A capillary tube is placed vertically in a liquid. If the cohesive force is less than the adhesive force, then

Q. The angle of contact of a liquid-solid interface is explained by saying that the liquid surface must be ____________ to the resultant of adhesive, cohesive and gravitational forces acting on it.

Q. Acute angle is an angle which is less than

90^{\circ}

and an obtuse angle is any angle which is greater than

90^{\circ}

.

What angle is greater than 90 degrees, but less than 180 degrees?

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