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IBDP Chemistry 2025 HL Questions

1.5 Ideal Gases

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Question 1

What happens to the pressure of an ideal gas if the temperature is doubled while keeping the volume constant?

A. Pressure remains unchanged.

B. Pressure is halved.

C. Pressure is doubled.

D. Pressure is quadrupled.

Select Answer

Question 2

At Standard Temperature and Pressure (STP), what is the volume occupied by 2 moles of an ideal gas?

A. 11.2 L

B. 22.4 L

C. 44.8 L

D. 89.6 L

Select Answer

Question 3

Which of the following best describes the behavior of gas particles according to the kinetic molecular

theory of gases?

A. The particles have significant volume and attract each other.

B. The particles are stationary and repel each other.

C. The particles are in constant random motion and do not attract or repel each other.

D. The particles move in a fixed path and have strong intermolecular forces.

Select Answer

Question 4

In the ideal gas equation PV=nRT, what does ‘n’ represent?

A. Number of moles of the gas

B. Normality of the gas

C. Newtonian force applied by the gas

D. Number of gas particles

Select Answer

Question 5

What is the impact on the volume of an ideal gas when its pressure is halved and its temperature is doubled, keeping the amount of gas constant?

A. The volume remains the same.

B. The volume is halved.

C. The volume is doubled.

D. The volume is quadrupled.

Select Answer

Question 6

Which of the following is not a characteristic of an ideal gas?

A. Particles occupy negligible space.

B. Particles exert significant gravitational forces.

C. Collisions between particles are elastic.

D. There are no intermolecular forces between particles.

Select Answer

Question 7

Why do real gases deviate from the ideal gas behavior at high pressures?

A. The volume of the gas particles becomes significant.

B. The gas particles become less mobile.

C. The temperature of the gas increases spontaneously.

D. The gas undergoes a phase change to a liquid.

Select Answer

Question 8

The ideal gas law can be used to calculate which of the following?

A. The color of a gas

B. The chemical reactivity of a gas

C. The molecular structure of a gas

D. The density of a gas at known conditions

Select Answer

Question 9

Which statement best explains why ideal gases do not liquefy?

A. They have strong intermolecular forces.

B. They are composed of large particles.

C. They have negligible intermolecular forces.

D. Their particles are in a fixed position.

Select Answer

Question 10

According to the kinetic molecular theory, what is the effect of increasing temperature on the average

kinetic energy of gas particles?

A. It decreases.

B. It remains constant.

C. It increases.

D. It first increases, then decreases.

Select Answer

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