Question

Gold sol can be prepared by

• A. hydrolysis of gold(III) chloride
• B. oxidation of gold by aqua regia
• C. peptization
• D. treating gold(III) chloride with metallic zinc
• E. reduction of gold(III) chloride with formalin solution

Hint:

Remember that metal salts are reduced to metal sols, whereas non-metal sols (like Sulfur) are often formed via oxidation (e.g., \(H_2S + SO_2\)).

Answer 1

Answer: (E)