JEE Advanced · Chemistry · 20. Metallurgy
Native silver metal forms a water soluble complex with a dilute aqueous solution of \(\mathrm{NaCN}\) in the presence of
- A nitrogen
- B oxygen
- C carbon dioxide
- D argon
Answer & Solution
Correct Answer
(B) oxygen
Step-by-step Solution
Detailed explanation
A water soluble complex of silver with a dilute aqueous solution of \(\mathrm{NaCN}\) is sodium argentocyanide. In the cyanide process, the native form is crushed and treated with \(0.1-0.2 \%\) solution of \(\mathrm{NaCN}\) and aerated.
\(4 \mathrm{Ag}+8 \mathrm{NaCN}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \longrightarrow 4 \mathrm{Na}\) \(\left[\mathrm{Ag}(\mathrm{CN})_2\right]+4 \mathrm{NaOH}\)
Argentocyanide is soluble. Further, metals are recovered from the complex by reduction with zinc
\(4 \mathrm{Ag}+8 \mathrm{NaCN}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \longrightarrow 4 \mathrm{Na}\) \(\left[\mathrm{Ag}(\mathrm{CN})_2\right]+4 \mathrm{NaOH}\)
Argentocyanide is soluble. Further, metals are recovered from the complex by reduction with zinc
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