Some Basic Principles Of Organic Chemistry Question 232
Question: During the extraction of gold the following reactions take place $ Au+C{{N}^{-}}+H_2O\xrightarrow{o_2}X,,X+Zn\to Y+Au $ Here, X and Y respectively are
Options:
A) $ {{[ Au(CN_4) ]}^{3-}} $ and $ {{[ Zn{{(CN)}_4} ]}^{2-}} $
B) $ {{[ Au(CN_2) ]}^{-}} $ and $ {{[ Zn{{(CN)}_6} ]}^{4-}} $
C) $ {{[ Au(CN_4) ]}^{4-}} $ and $ {{[ Zn{{(CN)}_4} ]}^{2}} $
D) $ {{[ Au(CN_4) ]}^{4-}} $ and $ {{[ Zn{{(CN)}_4} ]}^{2-}} $
Show Answer
Answer:
Correct Answer: D
Solution:
$ 4Au(s)+8C{{N}^{-}}(aq)+2H_2O(aq)\xrightarrow{O_2} $ $ 4{{[Au\underset{X}{\mathop{{{(CN)}_2}}},]}^{-}}+4O{{H}^{-}}(aq) $
$ 2{{[Au{{(CN)}_2}]}^{-}}(aq)+Zn(s)\to \underset{Y}{\mathop{{{[Zn{{(CN)}_2}]}^{2-}}}},(aq)+2Au(s) $
