Step-by-step explanation:
Every gas molecules are held by weak Vander waal forces because of which each molecule of a gas is free is move from one place to another.
This causes more number of collisions between molecules of a gas and gaps will also increase between each molecule.
As a result, gases are able to diffuse or spread at a faster rate.
Hence, generally it is true about the particles in a gas that gases diffuse at a faster rate.