First slide

Surface tension and surface energy

Question

Mercury does not wet glass, wood or iron because

Moderate

A

Cohesive force is less than adhesive force
B

Cohesive force is greater than adhesive force
C

Angle of contact is less than 90^o
D

Cohesive force is equal to adhesive force

Solution

The glass rod is not wet when dipped in mercury because; the cohesive force of mercury molecules is more than the adhesive force between glass and mercury molecules

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