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Gold sol can be prepared by...

Gold sol can be prepared by

A

hydrolysis of gold (lll) chloride

B

oxidation of gold by aqua-regia

C

reduction of gold (III) chloride with formalin solution

D

treating gold (II) chloride with metallic zinc

Text Solution

Verified by Experts

The correct Answer is:
D
Gold sol can be prepared by reducing goid (III) chloride with formalin solution (aqueous solution of sormaldhyde)
`{:(Au Cl _(3) + ubrace(3 HCO + 3 H _(2)O)overset("Reduction")to),(" ""Formalinsolution"):} underset(Sol) ( 2 Au) + 3 HCOOH + 6 CHl`
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