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Which of the following colloidal solutions is NOT lyophilic (solvent-attracting)?

1. Gelatin sol
2. Silver sol
3. Sulphur sol
4. As2S3 sol

Correct answer: Silver sol

Solution

Lyophilic colloids: gelatin, starch, gum, albumin — these are solvent-loving. Lyophobic colloids: metal sols (silver, gold), sulphur sol, As2S3 sol — these have no strong affinity for the solvent and are less stable. Gelatin sol is lyophilic; Silver sol, Sulphur sol, and As2S3 sol are all lyophobic. The single most iconic lyophobic example here is Silver sol. The question likely expects one answer: Silver sol (as it is the most representative non-lyophilic choice among the options).

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