1.

Classify the following sols according to their charges : (a) gold sol (b) ferric hydroxide sol (c) gelatine (d) blood (e) sulphur (f) arsenious sulphide (g) titanium oxide.

Answer» Negatively charged colloidal sol : (a), (c), (d), (e), (f).
Positively charged colloidal sol : (b), (g).


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