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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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in Chemistry – Class 12 by (188k points)
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 dust

I 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

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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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