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Question

Colloidal solutions of metals like gold, silver and platinum are generally prepared by using

A
Peptization
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B
Bredig's arc method
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C
Exchange of solvent
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D
Oxidation method
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Solution

The correct option is B Bredig's arc method
Electrical disintegration method is also known as Bredig's arc method.
Colloidal sols of metals such as gold, silver, platinum, etc.,​ are prepared by this method.
This process involves both dispersion & condensation.
Here, the electric arc is struck between metal electrodes immersed in ​the dispersion medium​.
The intense heat produced vapourises the metal (dispersion), which then condenses to form particles of colloidal size.

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