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In cyamide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.
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$\mathrm{O}_2$ and Zn dust
The extraction of silver involves in cyanide process are
(i) $\mathrm{Ag}_2 \mathrm{~S}+2 \mathrm{CN}^{-}+\mathrm{O}_2 \longrightarrow 2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{SO}_2$
(ii) $\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{Zn} \longrightarrow\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}+\mathrm{Ag}$
Thus, in (i) $\mathrm{O}_2$-act as oxidising agent (oxidise sulphide to $\mathrm{SO}_2$ ) and in (ii) Zn act as reducing agent (reduce $\mathrm{Ag}^{+}$to Ag ).
(i) $\mathrm{Ag}_2 \mathrm{~S}+2 \mathrm{CN}^{-}+\mathrm{O}_2 \longrightarrow 2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{SO}_2$
(ii) $\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}+\mathrm{Zn} \longrightarrow\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}+\mathrm{Ag}$
Thus, in (i) $\mathrm{O}_2$-act as oxidising agent (oxidise sulphide to $\mathrm{SO}_2$ ) and in (ii) Zn act as reducing agent (reduce $\mathrm{Ag}^{+}$to Ag ).
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