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Colloidal gold can be prepared by

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Hydrolysis

Bredig’s Arc method

By reduction of ${AuCl}_{3}$

Peptization

answer is A, B.

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Detailed Solution

Bredigs arc method is a method of preparation of colloidal solution, of metals such as gold, silver or platinum
By reduction of ${AuCl}_{3 ∣}$

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