Question

Cohesive force is experienced between
A. Magnetic substances
B. Molecules of different substances
C. Molecules of same substances
D. None of these

Answer 1

Let us first recall and hence define what cohesive force is. You may recall that we have always related this force to that related to water molecules. Along with this, you could also explain adhesive force between molecules and also explain how it is different from cohesive force.

Complete step-by-step solution:
In the question, we are given few options and we are supposed to find which among them has the possibility to experience cohesive force between them.
Cohesive force and adhesive force are two of the forces that exist between molecules. Adhesion is known to be the tendency of the molecules to bond with each other and cohesion force of attraction that exists between the same molecules. We should note that both these mentioned forces vary in their respective strengths. That is, we could say that the cohesive force that exists between water molecules is stronger when compared to the adhesive force between them when each molecule tends to be attracted to each other and thereby results in settling and the vice versa is true when the same molecules tend to disperse.
Therefore, we found that the cohesive force is that force that is experienced between the molecules of the same substances. Hence, option C is true.

Note: So, one should note that these forces together help in the process of surface tension. If you wonder why, it is done by maintaining balance between water molecules, outside surfaces and also the environment. Also, the net force is experienced by the water molecules in a certain direction and thereby attain minimum surface area and hence forming water droplets.