19. The surface tension of a liquid at its boiling point
(a) Becomes zero
(b) Becomes infinite
(c) is equal to the value at room temperature
(d) is half to the value at the room temperature
Ans. a
(10)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)