Gases have the highest rate of diffusion among all three states of matter. True.

Explanation:

1. Diffusion:
Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration. It occurs due to the random motion of particles. Diffusion is an important process in nature as it allows for the mixing and spreading of substances.

2. Factors affecting the rate of diffusion:
The rate of diffusion is influenced by various factors including temperature, particle size, and the nature of the substance. However, the state of matter also plays a significant role in determining the rate of diffusion.

3. Comparison of diffusion rates among different states of matter:
The rate of diffusion is highest in gases, followed by liquids, and then solids. This can be explained by the following factors:

a) Particle spacing:
In gases, particles are widely spaced and have high kinetic energy. They move rapidly and collide with each other, leading to the rapid mixing and spreading of gases. The large intermolecular distances in gases allow for more free movement of particles, enhancing diffusion.

In liquids, particles are closer together compared to gases, but they still have sufficient kinetic energy to move and diffuse. The intermolecular distances in liquids are smaller than gases, so the rate of diffusion is slower compared to gases.

In solids, particles are tightly packed and have limited mobility. The intermolecular distances in solids are very small, which restricts the movement of particles. As a result, the rate of diffusion in solids is significantly slower compared to liquids and gases.

b) Nature of intermolecular forces:
Gases have weak intermolecular forces, which allows for easy separation and movement of particles. The weak forces between gas particles facilitate faster diffusion.

Liquids have stronger intermolecular forces compared to gases. These forces tend to hold the particles closer together, reducing the rate of diffusion.

Solids have the strongest intermolecular forces, which tightly bind the particles together. The strong forces in solids make diffusion very slow.

4. Conclusion:
In conclusion, gases have the highest rate of diffusion among all three states of matter due to their widely spaced particles, high kinetic energy, and weak intermolecular forces. Liquids have a slower rate of diffusion compared to gases, and solids have the slowest rate of diffusion due to their close-packed particles and strong intermolecular forces.