Water does not wet an oily glass because

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(D) The force of attraction between the same molecules is called cohesive force,and the force of attraction between different molecules is called adhe

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Cohesive force of water is greater than adhesive force between water and oil molecules

Vedclass · Answer

(D) The force of attraction between the same molecules is called cohesive force,and the force of attraction between different molecules is called adhesive force.When water comes into contact with an oily surface,it forms an obtuse angle of contact.This indicates that the cohesive force between water molecules is significantly stronger than the adhesive force between water molecules and oil molecules.Because the cohesive force dominates,the water molecules prefer to stick to each other rather than spreading over the oily surface,preventing the glass from getting wet.Therefore,the correct reason is that the cohesive force of water is greater than the adhesive force between water and oil molecules.

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