Home Chemistry Surface Chemistry General Colloidal solutions of metals like gold can …
Chemistry Surface Chemistry General Single Correct MCQ
Published on: August 13, 2026

Colloidal solutions of metals like gold can be prepared when their salt solutions react with certain substance like formaldehyde, phenyl hydrazine, etc.

The above method is an example of

A
Reductions method
B
Oxidations method
C
Hydrolysis method
D
Double decompositions method

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The correct answer is:
A

Salt solutions of gold is being reduced to gold by using a recuing agent like

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