Q83
A gas can be liquified by pressure alone only, when its temperature is __________ its critical temperature.
A.
Less than
B.
More than
C.
Equal to or higher than
D.
Less than or equal to
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Only below and at the critical point there is strong demarcation in properties of liquids and gases above the critical point we can’t recognize the difference. Hence for a gas which is under or at the critical point can be liquefied. For a gas above critical point can also undergo a pressure change but we can’t notice the difference in properties.