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Question

Colloidal gold can be prepared by :

A
Bredig's are method
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B
Reduction of AuCl3
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C
Hydrolysis
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D
Peptization
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Solution

The correct options are
A Reduction of AuCl3
D Bredig's are method
Colloidal gold is a suspension (or colloid) of sub-micrometer size particles of gold in a fluid usually water.
Generally, gold nano-particles are produced in a liquid (liquid chemical methods) by reduction of chloro-auric acid (H[AuCl4]).
The other methods of preparation are as follows:
1) Turkevich method

2) Bredig's are method
3) Brust method
4) Perrault method
5)
Martin method.

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