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Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.

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Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.<br /><img src='https://www.fatskills.com/class12science/chemistry-questions-answers-importance-applications-coordination-compounds-q3.png' alt='Water + air completes equation for the extraction process of gold using potassium cyanide' width='574' height='48' />






 
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