In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
In the cyanide extraction process of silver from argentite ore, the oxidising and reducing agents used are
- $\mathrm{O}_{2}$ and $\mathrm{CO}$ respectively
- $\mathrm{O}_{2}$ and $\mathrm{Zn}$ dust respectively
- $\mathrm{HNO}_{3}$ and $\mathrm{Zn}$ dust respectively
- $\mathrm{HNO}_{3}$ and $\mathrm{CO}$ respectively
Solution
The reactions involved in cyanide extraction process are:
$\underset{\text { (argentite) }}{\mathrm{Ag}_{2} \mathrm{~S}}+4 \mathrm{NaCN} \rightarrow 2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+\mathrm{Na}_{2} \mathrm{~S}$
$4 \mathrm{Na}_{2} \mathrm{~S}+\underset{\text { Oxiding agent }}{5 \mathrm{O}_{2}}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{Na}_{2} \mathrm{SO}_{4}+4 \mathrm{NaOH}+2 \mathrm{~S}$
$2 \mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]+\underset{\begin{array}{c}\text { (reducing } \\ \text { agent) }\end{array}}{\mathrm{Zn}} \rightarrow \mathrm{Na}_{2}\left[\mathrm{Zn}(\mathrm{CN})_{4}\right]+2 \mathrm{Ag} \downarrow$
Asked in: JEE Advanced 2012 (Paper 2)
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