MELE Practice Questions - PRC Metallurgical Engineer Licensure Examination Exam

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What is the stoichiometric chemical equation that represents the cyanidation of gold, commonly known as Elsner's Equation?

4Au + 8NaCN + O2 + 2H2O -> 4Na[Au(CN)2] + 4NaOH 2Au + 4NaCN + H2O -> 2Na[Au(CN)2] + NaOH + H2 Au + 2NaCN + H2O -> Na[Au(CN)2] + NaOH + 0.5H2 4Au + 8NaCN + 2H2O -> 4Na[Au(CN)2] + 4NaOH + H2

Correct Answer:

4Au + 8NaCN + O2 + 2H2O -> 4Na[Au(CN)2] + 4NaOH

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