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what is the effect of impurities on the surface tension of liquid.

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The presence of impurities either on the liquid surface or dissolved in it, considerably affect the force of surface tension, depeneding upon the degree of contamination. A highly soluble substance like sodium chloride when dissolved in water, increases the surface tension of water. But the sparingly soluble substance like phenol when dissolved in water, reduces the surface tension of water.
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Assertion : The impurities always decrease the surface tension of a liquid. Reason : The change in surface tension of the liquid depends upon the degree of contamination of the impurity.

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