According to the kinetic theory of gases, which of the following statements is WRONG?

• Correct answer
  A

  The pressure exerted by a gas is due to the collisions between the molecules of the gas
• B

  Collisions between the molecules of a gas and that of the molecules with the walls of the containers are perfectly elastic
• C

  All molecules of a gas are identical
• D

  The molecules do not exert appreciable force on one another except during collision

Hence, the correct answer is option: 'A'.