NEET | 2017MetallurgyHard

Question

Extraction of gold and silver involes leaching with CN–ion. Silver is later recovered by :-

Options

A.

distillation

B.

zone refining

C.

displacement with Zn

D.

liquation

Solution

Mac arther forest process/cyanide process
Ag2S + 4NaCN →O2 2Na[Ag(CN)2]+ Na2SO4
2Na[Ag(CN)2] →Zn Na2[Zn(CN)4]+Ag (↓)
                                             Soluble complex
Ag extracts by displacement with Zn
 

Create a free account to view solution

View Solution Free
Topic: Metallurgy·Practice all Metallurgy questions

More Metallurgy Questions

Ellingham diagram represents :...Poling process is used for the :...In the commercial electrochemical process for aluminium extraction, the electrolyte used is :...Mercury is purified by:...Consider the following isolation / purification processes. (I) Heating impure metal with I2 at 150 - 200oC and passing t...