Breding arc method can not be used to prepare colloidal solution of
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Correct Answer: B. Fe
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Bredig's arc method is suitable for the preparation of colloidal solution of metal like gold, silver, platinum etc. An arc is struck between the metal electrode under the surface of water containing some stabilizing agent such as a trace of KOH. However, Fe does not react with alkalies that is why it is not obtained by Bredig's-arc method.
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