Which of the following leads to a higher rate of diffusion?

cooled gas
higher molar mass of particles
higher velocity of particles
reduced temperature

Answer;

Higher velocity of particles

Explanation;

The diffusion rate is determined by a variety of factors which includes;

Temperature such that the higher the temperature, the more kinetic energy the particles will have, so they will move and mix more quickly and the diffusion rate will be high.Concentration gradient such that the greater the difference in concentration, the quicker the rate of diffusion.Higher velocity of particles increases the diffusion rate as this means more kinetic energy by the particles and hence the particles will mix and move faster, thus higher diffusion rate.