Question

For a fixed volume of gas the pressure is increased when the temperature increases. This is due to:

• A. increase in the average molecular speed
• B. increase in the rate of collisions
• C. increase in the molecular attraction
• D. decrease in the mean free path

Answer 1

The correct option is A increase in the average molecular speed

The average molecular speed is proportional to the square root of temperature.

$v=\frac{8RT}{\pi M}$

With the increase in temperature, the average molecular speed increases due to which the pressure increases.

Hence, the correct option is $\text{A}$