Related questions

Question

Gold is isolated from rocks by reaction with aqueous cyanide, CN-: 4Au (s) + 8NaCN (aq) + O2 (g) + H20 ---------> 4Na[Au(CN)2] (aq) + 4NaOH (aq). The [Au(CN)2]- ion can be converted back to Au(0) by reaction with Zn (s) powder. Write a balanced chemical equation for this reaction?