Under what condition will diffusion take place most rapidly?

Question

a
movement through a permanent barrier
b
movement from an area of low concentration to high concentration
c
movement from an area of high concentration to an area of low concentration
d
movement against a concentration gradient

Answer 1

Diffusion will take place most rapidly under the condition described by:

c movement from an area of high concentration to an area of low concentration.

This is because diffusion is the process where molecules move from a region of higher concentration to a region of lower concentration, seeking to reach equilibrium, and this movement generally occurs spontaneously and most quickly in that direction.