Chemistry
Assertion (A): Gases exert pressure on the walls of the container they are kept in.
Reason (R): Gas molecules have a large kinetic energy. They strike the walls of the container in which they are kept with a certain force. The force per unit area is responsible for the pressure of the gas.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
Both A and R are true and R is the correct explanation of A.
Explanation— Gas exerts uniform pressure on the walls of the containing vessel. The reason is that the particles (molecules) of the gas collide with each other and with the walls of the containing vessel. Since a large number of particles (molecules) suffer collisions with the wall, an appreciable force acts on the wall. The force exerted on a unit area of the wall of the vessel is equal to the pressure of the gas. Hence, both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Related Questions
Assertion (A): Inflating a balloon seems to violate Boyle's law.
Reason (R): Boyle's law is valid for a fixed mass. Here, the mass of gas is changing.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The volume occupied by a gas is negligible at zero degree centigrade temperature.
Reason (R): Molecular motion ceases at 0 K.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The volumes of gases are first converted into STP conditions and then compared.
Reason (R): Volume does not vary with temperature and pressure in gases.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): When stating the volume of a gas, the pressure and temperature should also be given.
Reason (R): The volume of a gas is inversely proportional to temperature and directly proportional to pressure.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.