Multiple choice

By which of the following reactions can gold sol be prepared?

  1. Hydrolysis of gold(III) chloride

  2. Oxidation of gold by aqua regia

  3. By peptization

  4. Reduction of gold (III) chloride formalin solution

  5. None of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because gold chloride reacts with formaldehyde and water to give gold sol and formic acid.