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Question

A gas exerts pressure on the walls of the container because


A

during their motion, they collide with one another and also with the walls of the container

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B

gases do not exert pressure

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C

pressure is exerted only when the walls of the container are weak

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D

molecules present in gases always move in straight lines.

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Solution

The correct option is A

during their motion, they collide with one another and also with the walls of the container


The molecules of a gas are free to move randomly in all directions. During their motion, they collide with one another and also with the walls of the container. The constant bombardment of the molecules on the walls of the container exerts a steady force. This force acting per unit area on the walls of the container is called pressure. Thus, gases exert pressure on the walls of the container.


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