AP EAMCET · Chemistry · Surface Chemistry
This equation represents the preparation of gold sol by \(2 \mathrm{AuCl}_3+3 \mathrm{HCHO}+3 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Au}+3 \mathrm{HCOOH}+6 \mathrm{HCl}\).
- A Oxidation
- B Reduction
- C Double decomposition
- D Hydrolysis
Answer & Solution
Correct Answer
(B) Reduction
Step-by-step Solution
Detailed explanation
In the given reaction, gold \((\mathrm{Au})\) goes from +3 state in \(\mathrm{AuCl}_3\) to zero in \(\mathrm{Au}\). Thus, reduction is taking place in the preparation of Au sol.
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