Question

Coagulation of gold sol takes place when ____ is added to a gold sol.

Answer 1

Answer:

Coagulation of gold sol takes place when Magnesium chloride(MgCl2) is added to a gold sol.

Explanation:

Gold sol carries negative charge whereas Magnesium ions present in Magnesium Chloride carry positive charge and so it easily coagulates the gold sol.

Gold sol is actually colloidal gold that results when a reducing agent is boiled along with tetracholoroauric acid.