IGCSE Chemistry Quiz - Diffusion and Molecular Mass

Question 1

Which gas would diffuse fastest at room temperature?

Accepted Answer

Hydrogen (H₂)

Question 2

What is the relationship between relative molecular mass and rate of diffusion?

Accepted Answer

Inversely proportional

Question 3

Which gas would diffuse the slowest?

Accepted Answer

Sulfur dioxide (SO₂)

Question 4

If gas A diffuses faster than gas B, what can be inferred?

Accepted Answer

A has a lower molecular mass than B

Question 5

Which gas will take the longest time to spread in a room?

Accepted Answer

Argon (Ar)

Question 6

According to kinetic theory, lighter gas molecules diffuse faster because they:

Accepted Answer

Have higher speeds

Question 7

Which pair of gases will show the largest difference in diffusion rates?

Accepted Answer

Hydrogen and chlorine

Question 8

Why does ammonia gas diffuse faster than hydrogen chloride gas?

Accepted Answer

It has a lower molecular mass

Question 9

Which of the following statements is true?

Accepted Answer

Gases with lower molecular mass diffuse faster

Question 10

What happens to the diffusion rate if the molecular mass of gas increases?

Accepted Answer

Decreases

Question 11

Which property determines the speed of gas particle diffusion?

Accepted Answer

Relative molecular mass

Question 12

How does Graham's law relate to gas diffusion?

Accepted Answer

Rate ∝ 1/√(molecular mass)

Question 13

In an experiment with ammonia and hydrogen chloride, the white ring forms closer to:

Accepted Answer

Hydrogen chloride end

Question 14

Which of these gases will have the highest diffusion rate at room temperature?

Accepted Answer

Helium (He)

Question 15

If gas X has twice the molecular mass of gas Y, how do their diffusion rates compare?

Accepted Answer

Y diffuses √2 times faster

Quiz IGCSE Chemistry – 1 States of matter – 1.2 Diffusion – 2 Describe and explain the effect of relative molecular mass on the rate of diffusion of gases