Question

Two matchsticks are laid side-by-side on the surfaces of water. When a drop of light oil on the end of a third match stick is touched to the surface film between the two floating sticks, the two match sticks :
A) Will move apart rapidly
B) Will remain as they are
C) Will come closer
D) Will be joined

Answer 1

Hint:Surface tension of water is higher than that of surface tension of oilDue to the relatively high attraction of watermelons to each other through a web of hydrogen bonds, the surface tension of water is high

Complete Step by step solution:
Consider the matchsticks of both matches. Since oil has a lower surface tension than water, matches are more attracted to water, that is, away from the oil side and thus they tend to dissociate faster.

Additional information: Surface tension: "The surface property of a liquid that allows it to resist an external force due to the harmonious nature of its molecules."
Cohesive forces between liquid molecules are responsible for a phenomenon known as surface tension. Molecules on the surface of a glass of water do not have other water molecules around them and as a result they are more strongly attached to those that are directly associated with them. It is not really true that "skin" is formed on the surface of water; In contrast to the attraction of water molecules to the air, strong cohesion between water molecules makes it more difficult for an object to move through the surface when it is completely submerged.

Notes:Interfacial or surface tension is present when two phases are present. These phases can be gas / oil, oil / water, or gas / water. Interfacial tension is the force that holds the surface of a particular phase together and is commonly measured in dynes / cm. The surface tension between gas and crude oil ranges from about zero to about 34 dynes / cm. It is a function of pressure, temperature and structure of each phase.