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Question
Gold is extracted by making soluble cyanide complex. The cyanide complex is ______.
Options
[Au(CN)4]−
[Au(CN)2]−
[Au(CN)3]−
[Au(CN)]−
MCQ
Fill in the Blanks
Solution
Gold is extracted by making soluble cyanide complex. The cyanide complex is [Au(CN)2]−.
Explanation:
\[\ce{4Au + 8 KCN + 2H2O + O2 -> \underset{Soluble}{4K [Au(CN)2]} + 4KOH}\]
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