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The value of surface tension of a liquid at critical temperature

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Important Questions on Surface Tension

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It is easy to wash clothes in hot water because its
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Assertion: Oil spreads on cold water.

Reason: The surface tension of oil is greater than that of cold water.

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Which of the following liquids has the maximum value of surface tension?

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At which of the following temperatures, the value of surface tension of water is minimum?
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The graph between surface tension and temperature T is

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Which one of the following will make its way most easily through the tiny space between the fibre of the clothing?
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The value of surface tension of a liquid at critical temperature is