Multiple choice

Which of the following methods is used for obtaining metals like silver, gold and platinum, in colloidal state?

  1. Peptization

  2. Oxidation

  3. Reduction

  4. Hydrolysis

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

A number of metals such as silver, gold and platinum, have been obtained in colloidal state by treating the aqueous solution of their salts, with a suitable reducing agent such as formaldehyde, phenyl hydrazine, hydrogen peroxide, stannous chloride etc..