Q. 14.2( 4 Votes )

Consider a collision between an oxygen molecule and a hydrogen molecule in a mixture of oxygen and hydrogen kept at room temperature. Which of the following are possible?
A. The kinetic energies of both the molecules increase.

B. The kinetic energies of both the molecules decrease.

C. Kinetic energy of the oxygen molecule increases and that of the hydrogen molecule decreases.

D. The kinetic energy of the hydrogen molecule increases and that of the oxygen molecule decreases.

Answer :

1. According to kinetic theory of ideal gases, molecules of a gas are in incessant random motion, colliding against each other and with the walls of the container. All these collisions are perfectly elastic collision.


2. In perfectly elastic collision, total kinetic energy of gas is conserved.


3. Here, we have a mixture of oxygen and hydrogen gas. Therefore


K.E of oxygen + K.E of hydrogen=constant


4. So, if kinetic energy of oxygen molecules increases, then kinetic energy of hydrogen molecules decreases or vice-versa so that, sum of both kinetic energies remains constant.


5. Therefore, both option (c) and (d) are correct.

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