JEE Advanced · 2012 · 08 Apr 2012 · Paper 2 · General Principles and Processes of Isolation of Metals

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents used are

(A) $O_{2}$ and CO respectively.
(B) $O_{2}$ and Zn dust respectively.✓ Correct
(C) $HNO_{3}$ and Zn dust respectively.
(D) $HNO_{3}$ and CO respectively.

Answer: (B)

Solution

In the cyanide extraction process, argentite ore (Ag₂S) is first treated with NaCN to form Na[Ag(CN)₂]. The sulfide is oxidized by O₂ (oxidizing agent). The silver complex is then reduced by Zn dust (reducing agent) to precipitate metallic silver. The answer is (B): O₂ and Zn dust respectively.

JEE Advanced · 2012 · 08 Apr 2012 · Paper 2 · Single correct option

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