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General Principles and processes of Isolation of Elements
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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
Calcination
D
Thermal decomposition of metal complex
Solution
$A{{g}_{2}}S\,+\,2NaCN\,\xrightarrow{{{O}_{2}}}$ $Na\,[Ag{(CN)_2}]\, + \,N{a_2}S{O_4}$ $\xrightarrow{{Zn}}N{a_2}[Zn{(CN)_4}]\, + \,2Ag$
Standard 12
Chemistry
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