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In the cyanide extraction process of sil...

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

A

`O_(2)` and `CO` respectively

B

`O_(2)` and Zn dust respectively

C

`HNO_(3)` and Zn dust respectively

D

`HNO_(3)` and `CO` respectively

Text Solution

Verified by Experts

The correct Answer is:
B
Leaching : `Ag_(2)S + 4NaCn to 2Na[Ag(CN)_(2)] + Na_(2)S`
Passing of air causes oxidation of `Na_(2)S`, thereby forward reaction takes places.
`4Na_(2)S + underset("(air)")(5O_(2)) + 2H_(2)O to 2Na_(2)SO_(4) + 4NaOH + 2S`
Thus oxidation agent is `O_(2)`.
Now Zn dust will be used reduced complex of Ag to silver metal.
`2Na[Ag(CN)_(2)] + Zn to Na_(2)[Zn(CN)_(4)] + 2Ag darr`
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Statement-1:In cyanide process for the extraction of gold and silver from their natives, ores, the cuanide solution acts as a reducing agent to reduce the gold and siver compound present in the ores into the metallic states. Statement-2:In the extraction of gold and silver, the cyanide solution acts as complexing ragent in the presence of air and form their respective soluble complexes.