Which of the following is not added during th | vedclass

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(D) In the extraction of silver by the cyanide process (also known as the Mac-Arthur Forrest process),the silver ore is treated with a dilute solution

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$Na_2S_2O_3$

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(D) In the extraction of silver by the cyanide process (also known as the Mac-Arthur Forrest process),the silver ore is treated with a dilute solution of $NaCN$ in the presence of air to form a soluble complex,$Na[Ag(CN)_2]$. The chemical reaction is: $Ag_2S + 4NaCN \rightleftharpoons 2Na[Ag(CN)_2] + Na_2S$. Air is passed through the solution to oxidize $Na_2S$ to $Na_2SO_4$,preventing the reverse reaction. Finally,$Zn$ is added to the solution to displace silver from the complex: $2Na[Ag(CN)_2] + Zn \longrightarrow Na_2[Zn(CN)_4] + 2Ag \downarrow$. $Na_2S_2O_3$ is not used in this process.

Which of the following is not added during the extraction of silver by the cyanide process?

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