MCQ
Gelatin protects:
- AGold sol.
- B$\mathrm{As}_2 \mathrm{S}_3$ sol.
- C$\mathrm{Fe}(\mathrm{OH})_3$ sol.
- ✓All of these.
✓
Answer
Correct option: D.
All of these.
Gelatin is lyophilic sol. Lyophilic sol are formed by the direct mixing of substance in effective dispersing medium. These sols have strong force of interaction between dispersed phase and dispersed medium.
Gold sol$, \mathrm{As}_2 \mathrm{O}_3$ and $\mathrm{Fe}(\mathrm{OH})_3$ are lyophobic sols. Lyophobic sols have weaker force of interaction between dispersed phase and dispersed medium.
When a lyophilic sol is added to lyophobic sol, then a protective layer of lyophilic sol formed around each colloidal particle of the lyophobic sol which protects them from coagulation caused by electrolytes.
Gold sol$, \mathrm{As}_2 \mathrm{O}_3$ and $\mathrm{Fe}(\mathrm{OH})_3$ are lyophobic sols. Lyophobic sols have weaker force of interaction between dispersed phase and dispersed medium.
When a lyophilic sol is added to lyophobic sol, then a protective layer of lyophilic sol formed around each colloidal particle of the lyophobic sol which protects them from coagulation caused by electrolytes.
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