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Q. Gold sol can be prepared by

KEAMKEAM 2014Surface Chemistry

Solution:

Gold sol can be prepared by reducing gold $(III)$ chloride with formalin solution (aqueous solution of formaldehyde)

$2 AuCl _{3}+\underbrace{3 HCHO +3 H _{2} O }_{\text {Formalin solution }} \xrightarrow{\text{Reduction}} $

$\underset{\text { Sol }}{2 Au }+3 HCOOH +6 HCl $