Respuesta :
The intermolecular force is always stronger at the surface of a liquid than in the middle of the liquid because of the cohesive force present in the liquid molecule.
Surface tension of a liquid is the energy required to increase the surface area of a liquid by a unit of area. This surface tension in a liquid results from an imbalanced intermolecular forces, which is known as cohesive forces. The cohesive force is defined as the action of property of molecules, which sticks to one another due to the mutual attraction.
In the middle of the liquid, a molecule in the bulk liquid experience cohesive force. It experiences cohesive force with other molecules in the all directions. At the surface of a liquid, a liquid experiences net inward cohesive forces.
On the surface of a liquid, one molecule is not surrounded by other molecule. In the middle of a liquid, unbalanced attraction pull the molecules in a backward direction.
Therefore, the intermolecular force is always stronger at the surface of a liquid than in the middle of the liquid due to the cohesive force.
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