Multiple choice

The metals like silver, gold and platinum, have been obtained in colloidal state by

  1. by excessive cooling

  2. by exchange of solvent

  3. by hydrolysis

  4. by reduction
Reveal answer Fill a bubble to check yourself
D 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.

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