$(a)\;Reduction\qquad(b)\;Oxidation\qquad(c)\;Hydrolysis\qquad(d)\;Double\;decomposition$

Answer : Reduction

Explanation :

The colloidal solutions of metals are obtained by reduction of their compounds .

A solution of $\;Aucl_{3}+3 Sn Cl_{2}\; \to \; 3Sncl_{4}+2 Au \;Gold\; sol$

The reaction can also be carried out with formaldehyde , tannic acid or hydrazine .

$2 Aucl_{3}+3HCHO + 3 H_{2}O \; \to \; 2 Au + 3HCOOH+6Hcl\;Gold\;sol$

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