ion. The metal
is recovered by......
(a) displacement of
metal by some other metal from the complex ion.
(b) roasting
of metal complex.
(c) calcination
followed by roasting.
(d) thermal
decomposition of metal complex.
Answer:
(a) Extraction
of gold and silver involves leaching the metal with 
ion.
The metal is
recovered by
displacement of metal by some other metal from the complex ion.
This is an
oxidation reaction.
Here, Zn acts as a
reducing agent.
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