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Extraction of gold and silver involves l...

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

Text Solution

Verified by Experts

The correct Answer is:
D
Zn being more reactive than Ag and Au , displaces them .
From Native ore ,
`4Ag+8NaCN+2H_(2)O+O_(2) overset("Leaching")to underset("Soluble Sodium dicyanoargentate(I)")(4Na[Ag(CN)_(2)])+4NaOH`
`2Na[Ag(CN)_(2)]+Zn overset("Displacement")to Na_(2)[Zn(CN)_(4)]+2Ag darr `
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