Question

The surface tension of ___________ at critical temperature.

(a) one

(b) zero

(c) two

(d) three

This question was addressed to me in a job interview.

This is a very interesting question from States of Matter topic in section States of Matter of Chemistry – Class 11

Answer 1

Correct answer is (b) zero

To explain I would say: The surface tension in liquids decreases with rise in temperature. As surface tension decreases, molecules become more active when temperature increases and surface tension becomes zero at critical temperature TC.