JEE Advanced 2012 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced 2012

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

(A) and CO respectively.
(B) and Zn dust respectively.Correct
(C) and Zn dust respectively.
(D) and CO respectively.

Answer: (B)

Solution

Argentite () is leached with dilute NaCN: . Air is blown through the mixture; oxygen, the oxidising agent, oxidises the sulphide ion (to sulphate and sulphur), removing it and driving this reversible

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Question ID VK-026085