Question

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

• A. $HN{O}_3$ and $CO$ respectively
• B. $O_2$ and $Zn$ dust respectively
• C. $O_2$ and $CO$ respectively
• D. $HN{O}_3$ and $Zn$ dust respectively

Answer 1

The correct option is B $O_2$ and $Zn$ dust respectively

$A{g}_{2}S+4NaCN\rightleftharpoons 2Na\left[Ag\right(CN{)}_2]+N{a}_{2}S$

$N{a}_2{S}^{-2}+2O_2\to N{a}_2^{+6}S{O}_4$

$2Na\left[A{g}^{+1}\right(CN{)}_2]+Zn\to N{a}_2[Zn\left(CN{)}_4\right]+2A{g}^o\downarrow$