Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of suspension they do? Give reason.
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The colloidal particles are smaller and not heavy. They always remain in a state of zig-zag motion, called Brownian movement, which counters the force of gravity acting on colloidal particles and hence, helps in providing stability to colloidal sols by not allowing them to settle down.
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