What Is the Purpose of Adding Zinc Powder to a Solution

question 4

Multiple Choice

What is the purpose of adding zinc powder to a solution of Au(CN) ₂^- ?

• A) to precipitate the cyanide- gold complex
• B) to form a gold- zinc alloy
• C) to reduce the gold in the cyanide complex to gold metal
• D) to precipitate the cyanide ion
• E) to oxidize the gold in the cyanide complex to gold metal

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