Question

which technique involves passing a mixture through a porous barrier to separate particles based on size? filtration chromatography distillation magnetism

Explanation:

Filtration is a separation method where a mixture is passed through a porous barrier. Larger particles are retained by the barrier (residue), while smaller particles (along with the fluid) pass through (filtrate). Chromatography separates components based on differential affinities for stationary and mobile phases. Distillation separates based on differences in boiling points. Magnetism separates based on magnetic properties. The key here is separation based on particle size via a porous barrier, which is filtration.

Answer:

filtration