Q. Which of the following is involved in the extraction of Ag from argentite?

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$\left[\right.Ag\left(\right.NH_{3}\left(\left.\right)_{2}\left(\left]\right.\right)^{+}$

$\left[\right.Ag\left(\right.SCN\left(\left.\right)_{4}\left(\left]\right.\right)^{3 +}$

$\left[\right.Ag\left(\right.CN\left(\left.\right)_{2}\left(\left]\right.\right)^{-}$

$\left[\right.AgCl_{2}\left]\right.^{-}$

Solution:

$\left(\text{Ag}\right)_{\text{2}} \text{S} \, \text{+} \, \text{4} \, \text{NaCN} \overset{\text{Air}}{ \rightarrow } \text{2} \, \text{Na} \left[\right. \left(\text{Ag(CN)}\right)_{2} \left]\right. \text{+} \, \left(\text{Na}\right)_{\text{2}} \text{S}$

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