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Classify the following sols according to...

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

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