Explain the method of preparation of gold sol by reduction method. – InterviewSolution

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1.

Explain the method of preparation of gold sol by reduction method.

Answer»

Gold sol is prepared by the reduction of auric chloride using formaldehyde.

2AuCl₃ + 3HCHO + 3H₂O → 2Au (sol) + 6HCI + 3HCOOH

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