Qstnid -19- Extraction Of Gold And Silver Involves Leaching With ``Cn^-`` Ion. Silver Is Later Recovered By : - Previous Year Paper Year:2017 - Neet-xii-chemistry

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NEET-XII-Chemistry

Previous Year Paper year:2017

with Solutions - page 2

Qstn# 19 Prvs-Qstn Next-Qstn

#19
Extraction of gold and silver involves
leaching with ``CN^-`` ion. Silver is later recovered by :
(1) displacement with Zn
(2) liquation
(3) distillation
(4) zone refining
digAnsr: 1
Ans : (1)
Sol. Silver is extracted by cyanide process involving :
1. Complex formation
2. Metal displacement with zinc
Ag2S ⎯⎯ →⎯NaCN Na [Ag(CN)2] + Na2S
Zn
Ag + Na2 [Zn(CN)4]