Question

on addition of soluble
impurity in surface tension​

Answer 1

Answer:

As surface tension increases, intermolecular forces increase. ... The Presence of ImpuritiesThe presence of impurities on the surface of, or dissolved in, a substance directly affects the surface tension of the liquid. The surface tension of water, for example, will increase when highly soluble impurities are added to it.

Answer 2

hope this helps you:

In case of impurities, when a highly soluble impurity like NaCl is added to water, surface tension increases whereas it decreases for sparingly soluble (eg: phenol) or insoluble impurities. Hence, angle of contact (on addition of impurities) will decrease or increase accordingly.

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