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Bredig's arc method is mainly used for preparing colloidal sols of

  1. Aproteins such as gelatin
  2. Bmetals such as gold, silver and platinum
  3. Chydrated metal oxides such as
  4. Dnon-metals such as sulphur only

Answer: B

In Bredig's arc method an electric arc is struck between metal electrodes immersed in water. The metal vaporises and condenses into colloidal particles. The method is therefore used for metal sols such as Au, Ag and Pt.
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