Co-Ordination Compounds Question 72
Question: In the process of extraction of gold, Roasted gold ore $ +C{N^{-}}+H_2O\xrightarrow{O_2}[X]+O{H^{-}} $ $ [X]+Zn\to [Y]+Au $ Identify the complexes [X] and [Y]
[IIT-JEE 2003]
Options:
A) $ X={{[Au{{(CN)}_2}]}^{-}},,Y={{[Zn{{(CN)}_4}]}^{2-}} $
B) $ X={{[Au{{(CN)}_4}]}^{3-}},,Y={{[Zn{{(CN)}_4}]}^{2-}} $
C) $ X={{[Au{{(CN)}_2}]}^{-}},,Y=Zn{{(CN)}_6}{{]}^{4-}} $
D) $ X={{[Au{{(CN)}_4}]}^{-}},,Y={{[Zn{{(CN)}_4}]}^{2-}} $
Show Answer
Answer:
Correct Answer: A
Solution:
$ \underset{\text{gold ore}}{\mathop{Roasted}},+C{N^{-}}+H_2O\xrightarrow{O_2},{{[Au,{{(CN)}_2}]}^{-}}+O{H^{-}} $
$ {{[ Au,{{(CN)}_2} ]}^{,-}}+Zn\to {{[ Zn,{{(CN)}_4} ]}^{,2-}} $ .
