Question

Which of the following statements is not true regarding the effect of increasing temperature on the distribution of molecular motion in a gas?
1. Most likely speed increases.
2. The area under the distribution curve remains the same as below the lower temperature.
3. Distribution becomes widespread.
4. The fraction of molecules increases with the most possible speed.

Answer 1

Correct Answer - Option 4 : The fraction of molecules increases with the most possible speed.

The correct answer is The fraction of molecules increases with the most possible speed.

• On increasing the temperature, the motion of the gas molecules becomes rapid and hence the value of the most probable velocity also increases.
• As a result, the entire distribution curve becomes flatter, and peak shifts to regions of higher velocities
• As the temperature of the gas increases, the particles gain kinetic energy, and their speed increases.
  • The most probable speed is directly proportional to the square root of temperature.
• The area under the distribution curve remains the same as under the lower temperature.
  • The total area under the curve is independent of the temperature.
  • The area under the distribution curve represents the total number of molecules.