Q. Extraction of gold and silver involves leaching with $CN^-$ ion. Silver is later recovered by :
A) liquation
B) distillation
C) zone refining
D) displacement with Zn
Explanation
[Solution] $2[Ag(CN)_2]^- + Zn \rightarrow [Zn(CN)_4]^{2-} + 2Ag$. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.