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JEE Advanced2011ChemistryStates of MatterActual

According to kinetic theory of gases

Options

  1. Acollisions are always elastic
  2. Bheavier molecules transfer more momentum to the wall of the container
  3. Conly a small number of molecules have very high velocity
  4. Dbetween collisions, the molecules move in straight lines with constant velocities

Correct answer

A. collisions are always elastic

Step-by-step solution

(a) According to a postulate of kinetic theory of gases, collision between the molecules as well as with the wall of container is perfectly elastic in nature. (b) If a gas molecule of man ' m ' moving with speed ' u ' collide to the wall of container, the change in momentum is p=-2 mu . Therefore, heavier molecule will transfer more momentum to the wall as there will be greater change in momentum of the colliding gas malecule. However this was not postulated in kinetic theory of Gases. (c) According to Maxwell-Bolt

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