Principle involved in Bredig’s arc method is

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Dispersion followed by condensation

Condensation followed by Dispersion

Condensation only

Dispersion only

answer is A.

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Detailed Solution

An electric arc is struck between two metal electrodes (whose sol is to be prepared) immersed in dispersion medium (generally water) Intense heat produced vapourizes (dispersion) the metal which then condenses to form particles of colloidal size.

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