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9.2 , surface tension — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.2 , surface tension1 Mark
MCQ
If a glass rod is dipped in mercury and withdrawn out, the mercury does not wet the rod because
  • A
    Angle of contact is acute
  • ✓
    Cohesion force is more
  • C
    Adhesion force is more
  • D
    Density of mercury is more
✓

Answer

Correct option: B.
Cohesion force is more
b
(b) Cohesive force is the intermolecular attraction between like molecules, whereas adhesive force is the intermolecular force between unlecules. In the given case cohesive force between mercury molecules is more than adhesive force between mercury molecules and glass rod, hence mercury does not stick to rod.

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