Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.(a) Water(b) Oxygen(c) Water + air(d) Zinc dustI have been asked this question in an interview for internship.The origin of the question is Coordination Compounds Importance and Applications in section Coordination Compounds of Chemistry – Class 12

Given below is the incomplete equation for the extraction process of g

1.	Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.(a) Water(b) Oxygen(c) Water + air(d) Zinc dustI have been asked this question in an interview for internship.The origin of the question is Coordination Compounds Importance and Applications in section Coordination Compounds of Chemistry – Class 12
Answer» Correct answer is (c) Water + air The EXPLANATION is: Gold COMBINES with cyanide in the PRESENCE of air and water to form [Au(CN)2]^– in aqueous solution. This is then TREATED with zinc dust to obtain gold in metallic form.

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