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Explain why particles of a colloidal sol...

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do?

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In a colloidal solution, the particle size is smaller as compared to particle size in a suspension. The effect of gravity on these particles is less than in a suspension. Therefore, the particles in a suspension settle under the influence of gravity while they remain dispersed in a colloidal solution.
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