lyophilic sols are irreversible
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Answer: Lyophilic : Reversible, because on evaporating the liquid, the residue left will passes into colloidal state on addition of liquid. Lyophobic : Irreversible, because on evaporating the liquid, the residue left cannot be converted into solution on mere addition of liquid.
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In Lyophobic sol, weak forces of interaction exist between colloidal particles and liquid. ... Unlike Lyophilic colloids, the precipitations of lyophobic colloids do not regain their original state as coagulated mass cannot be dispersed into colloidal form. This shows that lyophobic sols are also irreversible in nature
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