Which of the following colloidal solutions ca | vedclass

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(B) Bredig's arc method is used for the preparation of colloidal sols of metals like $Au$,$Ag$,and $Pt$. In this method,an electric arc is struck betw

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$Fe$

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(B) Bredig's arc method is used for the preparation of colloidal sols of metals like $Au$,$Ag$,and $Pt$. In this method,an electric arc is struck between electrodes of the metal immersed in a dispersion medium. $Fe$ (Iron) cannot be prepared by this method because it is highly reactive and tends to form oxides or hydroxides rather than a stable colloidal sol of the metal itself.

Which of the following colloidal solutions cannot be prepared by Bredig's arc method?

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