A) Oxidation
B) Reduction
C) Self-reduction
D) Oxidation-reduction
Correct Answer: D
Solution :
[d] Extraction of \[Au\]and \[Ag\]involves leaching of the metals present in the ore with \[C{{N}^{\Theta }}\] (oxidation), since \[Ag\]and \[Au\]are oxidised to \[A{{g}^{\oplus }}\]and \[A{{u}^{\oplus }},\] which than combines with \[C{{N}^{\Theta }}\] ions to form their respective soluble complexes. The metals are then recovered from these complexes by reduction or displacement method using a more electropositive \[Zn\]metal
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