At the boiling point of water, its surface tension

Is infinite

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Is zero

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Is the same as that at room temperature

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Is maximum

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Solution

The correct option is B Is zero
As temperature increases, surface molecules escape from the surface. Due to this the interaction force between molecules decreases. As surface tension is the adhesive force of interaction between the molecules, thus surface tension becomes zero.

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A glass contains some water at room temperature $20^{0}$ C. Refrigerated water is added to it slowly. When the temperature of the glass reaches $10^{0}$ C, small droplets condense on the outer surface. Calculate the relative humidity in the room. The boiling point of water at a pressure of 17.5 mm of mercury is $20^{0}$ C and at 8.9 mm of mercury it is $10^{0}$ C.

The temperature at which the surface tension of water is zero

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At the boiling point of water, its surface tension

The correct option is B Is zeroAs temperature increases, surface molecules escape from the surface. Due to this the interaction force between molecules decreases. As surface tension is the adhesive force of interaction between the molecules, thus surface tension becomes zero.

The correct option is B Is zero
As temperature increases, surface molecules escape from the surface. Due to this the interaction force between molecules decreases. As surface tension is the adhesive force of interaction between the molecules, thus surface tension becomes zero.