Question

Which of the following is/are correct regarding the postulates of KTG?

• A. Volume of the molecules of the gas is negligible compared to the volume of the container.
• B. Molecules of the gas are in random motion.
• C. Collisions of the molecules of the gas with the walls of container are inelastic.
• D. Effect of gravity on the motion of the molecules is negligible.

Answer 1

Answer: (A), (B), (D)

The correct options are
A Volume of the molecules of the gas is negligible compared to the volume of the container.
B Molecules of the gas are in random motion.
D Effect of gravity on the motion of the molecules is negligible.

According to postulates of KTG :
$1$. Gas contains large number of molecules which are identical and the volume occupied by the molecules is negligible compared to the volume of container.
$2$. The molecules are in continuous random motion. This random motion is also known as Brownian motion.
$3$. Collisions made by the molecules with the walls of container are perfectly elastic.
$4$. Effect of gravity on the motion of the molecules is negligible.

Hence, options $\left(a\right),\left(b\right),$ & $\left(d\right)$ are correct.