Question

Assertion :Most probable velocity is the velocity possessed by maximum fraction of molecules at the same temperature. Reason: On collision, more and more molecules acquire higher speed at the same temperature.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

The most probable velocity at which the most molecules in a gas travel. The formula for most probable velocity is:

$v_p=\sqrt{\frac{2RT}{M}}$

The molecules are never in stationary state but they are believed to be in chaotic (random) motion.They travel in straight line in all possible directions with altogether different but constant velocities.The direction of motion is changed by the collision with container or with the other molecules.

The collision between molecules is perfectly elastic i.e., there is no change in the energies of the molecules after collision.