This equation represents the preparation of gold sol by 2 AuCl_3+3 HCHO+3 H_2 O arrow 2 Au+3 HCOOH+6 HCl .

Correct answer: (B) Reduction. In the given reaction, gold (Au) goes from +3 state in AuCl_3 to zero in Au . Thus, reduction is taking place in the preparation of Au sol.

Q25 / 160 · AP EAMCET 2023 (17 May Shift 2) · 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
Correct answer
B
Reduction
C
Double decomposition
D
Hydrolysis

Solution

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.

Hence, the correct answer is option: 'B'.

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