Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid- Consider the following statements-1- Its unit is Newton per Metre-2- The adhesion of water to glass is stronger than the cohesion of water-3- The maximum distance at which the molecules can attract each other is called molecular range-Which of the above statements is-are NOT correct-

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Particles of Matter Attract Each - Other

Surface tensi...

Question

Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid.
Consider the following statements:
Which of the above statement(s) is/are NOT correct?

Only 1 & 2

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Only 2 & 3

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Only 1 & 3

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None of the Above

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Solution

The correct option is D None of the Above
Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Its unit is Newton per Metre.
Surface Tension is essentially a molecular phenomenon. There are two types of molecular forces of attraction viz. adhesive force and cohesive force. Forces between molecules of different substances are called adhesive forces. The adhesive force is different for different pairs of substances. Gum or glue is an adhesive. The force of attraction between gum and paper is an adhesive force. Forces between molecules of the same substances are called cohesive forces. The cohesive forces are short range forces and therefore they are effective only up to a very small distance. The adhesion of water to glass is stronger than the cohesion of water. On the other hand, the cohesion of mercury is greater than its adhesion to glass. The maximum distance at which the molecules can attract each other is called molecular range. The molecular range is of the order of $10^{08}$ cm.

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Q. Water forms drop owing to attendance of its surface to contract. The surface of water acts like a stretched membrane by virtue of an effect called Surface Tension. For a small quantity of water, the effect of surface tension is greater than the weight of water; its surface contracts so as to achieve the smallest surface area. This implies a spherical shape.The phenomenon of surface tension is common to all liquids. The nature of this phenomenon can be understood on the basis of molecular forces. Consider a liquid with its surface open to the atmosphere. Some molecules of the liquid will escape from the surface and exist as a vapor above the surface. In fact, molecules on the surface are in a dynamic state. In equilibrium, some molecules are leaving the surface at any time to convert the vapor state and an equal number of molecules convert from the vapor state to the liquid state on the surface. Consequently, the number of molecules in the surface layer is smaller than in the layers lying below. Average separation between the surface molecules is slightly greater and attractive forces between them have a tendency to pull them together. This explains how the surface behaves like a stretched membrane and also the origin of surface tension. Inside the liquid, average intermolecular force is zero. Surface tension depends on temperature. As the temperature is increased, the exchange rate of molecules between the liquid and the vapor also increases. You are familiar with the quantitative definition of surface tension as the force acting per unit length on an imaginary line that separates adjacent sections of the surface of the liquid. It is possible, due to surface tension, that tiny objects of density more than the density of water can float on the surface of the water.
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^{o}

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As temperature is increased

Q. Consider the following statements.
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2. SI unit of surface tension is N/m.
3. Surface tension is a scalar quantity because it has no specific direction for a given liquid.
Which of the statement(s) given above is/are correct?

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Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Consider the following statements: Which of the above statement(s) is/are NOT correct?

Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid.
Consider the following statements:
Which of the above statement(s) is/are NOT correct?