The origin of charge on a colloidal solution is :

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It is due to the addition of protective colloids

Selective adsorption of ions on their surface

Electron capture during Bredig's arc method

Self-dissociation (in soaps and detergents)

answer is A, B, C.

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Detailed Solution

Most of the time, the preferential adsorption of either positive or negative ions on the surface of the sol particles is what causes their charge.
The following methods can be used to charge the sol particles electrically:
1. As a result of surface molecule dissociation.
2. As a result of frictional electrification
3. Because of ion-selective adsorption.
Bredig's Arc method-prepared colloidal solutions pick up a charge through electron capture.

Hence, the correct option is a, b and c.

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