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(C) Bredig's arc method is a specialized technique used for the preparation of colloidal sols of metals like gold,silver,and platinum. In this method,

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Bredig's arc method

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(C) Bredig's arc method is a specialized technique used for the preparation of colloidal sols of metals like gold,silver,and platinum. In this method,an electric arc is struck between electrodes of the metal immersed in a dispersion medium (water) cooled by ice. The intense heat vaporizes the metal,which then condenses to form colloidal particles.

Colloidal solution of gold is prepared by .............

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