Question

The metal extracted by leaching with a cyanide is

• A. $Al$
• B. $Ag$
• C. $Cu$
• D. $Na$

Answer 1

Answer: (B)

$Ag$

Answer 2

Silver are forms a soluble complex with NaCN form which silver is precipitated using scrap zinc.

(i) $Ag _{2} S +2 NaCN \longrightarrow Na \left[ Ag \left( CN _{2}\right] Zn \right.$

(ii) $Na _{2}\left[ Zn \left( CN _{k}\right]+ Ag \downarrow\right.$

Sodium argentocyanide (soluble)