Question

Increase in temperature of a gas filled in a container would lead to:

• A. increase in its mass
• B. increase in its kinetic energy
• C. decrease in its pressure
• D. decrease in intermolecular distance

Answer 1

The Correct Option is B

The question asks about the effect of increasing the temperature of a gas in a container. Let's analyze the options based on the principles of thermodynamics and kinetic theory of gases:

1. Increase in its mass: The mass of the gas in a closed container remains constant unless gas is added or removed. Increasing temperature does not affect the mass of the gas. Therefore, this option is incorrect.
2. Increase in its kinetic energy: According to the kinetic theory of gases, the kinetic energy of gas molecules is directly proportional to the temperature. As the temperature increases, the average kinetic energy of the gas molecules also increases. This is the correct answer.
3. Decrease in its pressure: For an ideal gas in a closed container, pressure (P) is related to temperature (T) by the equation: PV = nRT. As the temperature increases, either pressure increases or volume must increase to keep the equation balanced. However, the volume is constant in a rigid container. Therefore, pressure increases, not decreases. This option is incorrect.
4. Decrease in intermolecular distance: Increasing temperature causes gas molecules to move more rapidly, which tends to increase their separation rather than decrease it. This option is incorrect.

In conclusion, increasing the temperature of a gas in a container results in an increase in its kinetic energy, as per option 2. This is consistent with the kinetic theory of gases, where higher temperature leads to greater molecular motion and energy.