An ideal gas obeying kinetic theory of gases can be liquefied if
Its temperature is more than critical temperature Tc
Its pressure is more than critical pressure Pc
Its pressure is more than Pc at a temperature less than Tc
It cannot be liquefied at any value of P and T
As we learnt in
Critical Pressure -
Pressure applied on real gas at critical temperature
-
Absence of inter molecular attraction ideal gas cannot be liquefied at any volume of P and T.
Option 1)
Its temperature is more than critical temperature Tc
Incorrect
Option 2)
Its pressure is more than critical pressure Pc
Incorrect
Option 3)
Its pressure is more than Pc at a temperature less than Tc
Incorrect
Option 4)
It cannot be liquefied at any value of P and T
Correct
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