Question

Which of the following statements is false?
(a) The properties of N2(g) will deviate more from ideality at -100oC than at 100oC.
(b) Van der Waal's equation corrects for the non-ideality of real gases.
(c) Molecules of CH4(g) at high pressures and low temperatures have no attractive forces between each other.
(d) Molecules of an ideal gas are assumed to have no significant volume.
(e) Real gases do not always obey the ideal gas laws.

Answer 1

The only false statement is (c)

a)Real gases approach ideal gas behavior more closely at higher temperatures.So option (a) is true.

b)Van der waals equation takes volume correction and pressure correction into consideration.So it corrects the non-ideality of real gases.So option (b) is true.

c)Increasing the pressure and lowering the temperature leads to a decrease in the average distance between the molecules, so it is necessary to take into account the volume of molecules and the interaction between them.So option (c) is false.

d)This is the basic assumption of Kinetic molecular theory . So option (d) is true.

e)Real gases obey ideal gas laws only at low pressure.So for general case,real gases do not always obey the ideal gas laws. So option (e) is true.