MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic ChemistryMetallurgyExtraction of Gold and Silver
In the process of extraction of gold, Roasted gold ore + CN – + H2O -> [X] + HO – [X] + Zn -> [Y] + Au Identify the complexes [X] and [Y]
A.X = [Au(CN)2]✓ Correct
B.X = [Au(CN)4]
C.X = [Au(CN)2]
D.X = [Au(CN)4]
Explanation
The process of extraction of gold involves the following reaction: - - 2 2 Roasted gold ore+CN +H O [Au(CN) ] +HO -> - - 2 4 [Au(CN) ] +Zn Zn[(CN) ] +Au -> So from the equations: X = - 2 [Au(CN) ] and Y = 2- 4 [Zn(CN) ] METALLURGY 37
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