One of the following metals is obtained by leaching its ore with

One of the following metals is obtained by leaching its ore with dilute cyanide solution, Identify it.

Options

(a) titanium
(b) vanadium
(c) silver
(d) zinc

Correct Answer:

silver

Explanation:

Cyanide process: ‘Mac Arthur – forest cyanide process.’ The powdered argentite ore is agitated with a dilute solution of NaCN(0.5%) while a current of O₂ is constantly passed. The metallic silver or silver from the ore dissolves forming sodium argentocyanide. 2Ag₂S +8NaCN + O₂ + 2H₂O → 4Na[Ag(CN)₂] + 4NaOH + 2S. The soluble silver complex is filtered and treated with zinc dust when silver gets precipitated. 2Na[Ag(CN₂)] + Zn →Na₂[Zn(CN)₄] + 2Ag↓.

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