Question

Which statement(s) is/are applicable above critical temperature?

• A. A gas cannot be liquified
• B. The surface tension of a liquid is very high
• C. A liq. phase cannot be distinguished from a gas phase.
• D. Density changes continuously with P or V.

Answer 1

Answer: (A), (C), (D)

A gas cannot be liquified

Answer 2

Critical temperature is the upper limit of temperature at which a substance maintains its liquid state. Beyond this temperature, molecules possess excessive kinetic energy, preventing intermolecular attractive forces from maintaining a distinct liquid phase. When the temperature is lower than the critical temperature (T c ​ ), molecules are in close enough proximity for attractive forces to trigger condensation, whereas condensation does not occur above T c ​ .

The correct answer is/are option(s):
(A): A gas cannot be liquified
(C): A liq. phase cannot be distinguished from a gas phase.
(D): Density changes continuously with P or V.