Q. Which of the following statement is not true?
A) The pressure of a gas is due to collision of the gas molecules with the walls of the container.
B) The molecular velocity of any gas is proportional to the square root of the absolute temperature.
C) The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.
D) Kinetic energy of an ideal gas is directly proportional to the absolute temperature.
Explanation
(c)
According to Graham’s law the rate of diffusion is inversely proportional to square root of molecular weight and density.
$r \propto \frac{1}{\sqrt{d}}\ \ \ \ and\ \ \ r \propto \frac{1}{\sqrt{M}}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.