Question
Question: Extraction of gold and silver involves leaching the metal with \(\mathrm { CN } ^ { - }\)ion. The me...
Extraction of gold and silver involves leaching the metal with CN−ion. The metal is recovered by ____
A
Displacement of metal by some other metal from the complex ion
B
Roasting of metal complex
C
Calcinations followed by roasting
D
Thermal decomposition of metal complex
Answer
Displacement of metal by some other metal from the complex ion
Explanation
Solution
Displacement of Ag or Au from the solution is made by addition of electropositive metal like zinc.
