A) as a side product in electolytic refining of copper
B) Parkes process in which Zn is used to extract Silver by solvent extraction from molten lead
C) by reaction of silver sulphide with KCN, and then reaction of soluble complex with Zn
D) by heating\[Na[Ag{{(CN)}_{2}}]\]
Correct Answer: D
Solution :
Silver is not obtained by heating\[Na[Ag{{(CN)}_{2}}]\] It is obtained by treating\[Na[Ag{{(CN)}_{2}}]\]with more electropositive metal Zn, which replaces Ag from it. \[2Na[Ag{{(CN)}_{2}}]+Zn\to N{{a}_{2}}[Zn{{(CN)}_{4}}]+2Ag\downarrow \]
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