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Chapter 7: Problem 983

Surface tension of a liquid is found to be influenced by (A) It increases with the increase of temperature. (B) Nature of the liquid in contact. (C) Presence of soap that increase it. (D) Its variation with the concentration of the liquid.

Short Answer

Expert verified
The correct statements about the influence of surface tension are: - Statement B: Surface tension is influenced by the nature of the liquid in contact. - Statement D: Surface tension varies with the concentration of the liquid.

Step by step solution

01

Statement A: Increases with the increase of temperature.

Generally, surface tension decreases with the increase of temperature. This is because at higher temperatures, the molecules in the liquid have more kinetic energy and are moving faster, thus reducing the cohesive forces among them. So, statement A is not true.
02

Statement B: Nature of the liquid in contact.

Surface tension is indeed influenced by the nature of the liquid in contact. Different liquids have different molecular structures and properties, which in turn affect the cohesive forces among the molecules. This means that surface tension can vary depending on the liquid and the substances in contact with it. So, statement B is true.
03

Statement C: Presence of soap that increases surface tension.

The presence of soap, or any surfactant, actually decreases surface tension. A surfactant is a substance that reduces the cohesive forces between molecules at the surface of a liquid. This is why soaps and detergents help to clean surfaces by reducing the surface tension of water, allowing it to spread more easily and mix with other substances. So, statement C is not true.
04

Statement D: Variation with the concentration of the liquid.

Surface tension can indeed vary with the concentration of the liquid. As the concentration of a liquid increases, its surface tension may also increase. This is because the number of molecules per unit area at the surface increases, leading to stronger cohesive forces. So, statement D is true. In conclusion, the accurate statements about the influence of surface tension are: - Statement B: Nature of the liquid in contact. - Statement D: Variation with the concentration of the liquid.

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