Q. On a smooth glass surface , the drop of water spreads while the drop of mercury remains almost spherical. This proves that ________?
Answer: Cohesive forces of mercury is more than adhesive forces with glass
Notes: Cohesive forces refer to the forces of attraction between the molecules of the same substance, while adhesive forces refer to the forces of attraction between molecules of different substances. In the case of a drop of mercury on a smooth glass surface, the cohesive forces between the mercury molecules are stronger than the adhesive forces between the glass and the mercury. This causes the mercury to remain spherical in shape, rather than spreading out on the surface of the glass.

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