Bredig's arc method cannot be used to prepare | vedclass

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(B) . Bredig's arc method is suitable for the preparation of colloidal solutions of metals like gold,silver,and platinum. An electric arc is struck be

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$Fe$

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(B) . Bredig's arc method is suitable for the preparation of colloidal solutions of metals like gold,silver,and platinum. An electric arc is struck between the metal electrodes under the surface of water containing a stabilizing agent,such as a trace of $KOH$. However,$Fe$ does not form a stable colloidal sol using this method because it does not react with the stabilizing agent in the same way as noble metals,and it is prone to oxidation. Therefore,$Fe$ is not typically prepared by Bredig's arc method.

Bredig's arc method cannot be used to prepare a colloidal solution of which of the following?

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