With an increase in temperature , surface tension of liquid (except molten copper and cadmium)A. increasesB. remain sameC. decreasesD. first decreases then increases

With an increase in temperature , surface tension of liquid (except mo

1.	With an increase in temperature , surface tension of liquid (except molten copper and cadmium)A. increasesB. remain sameC. decreasesD. first decreases then increases
Answer» Correct Answer - C The surface tension of liquid decreases with rise of temperature . The surface tension of liquid is zero at its boiling point and it vanishes at critical temperature . At critical temperature intermolecular forces for liquid and gases becomes equal and liquid can expand without any restriction . for small temperature differences , the variation in surface tension with temperature is linear and is given by relation `T_(t) = T_(0) (1 - alpha t)` where `T_(t) , T_(0)` are the surface tension at `t^(@)C` and `0^(@)C` respectively and `alpha` is the temperature coefficient of surface tension.

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With an increase in temperature , surface tension of liquid (except molten copper and cadmium)A. increasesB. remain sameC. decreasesD. first decreases then increases

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