A) \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]
B) \[CuCN\]
C) \[Cu{{(CN)}_{2}}\]
D) \[{{K}_{2}}[Cu{{(CN)}_{4}}]\]
Correct Answer: A
Solution :
\[CuS{{O}_{4}}+2KCN\xrightarrow{{}}{{K}_{2}}S{{O}_{4}}+\underset{(unstable)}{\mathop{\underset{cupric\,cyanide}{\mathop{Cu{{(CN)}_{2}}}}\,}}\,\] \[2Cu{{(CN)}_{2}}\xrightarrow{{}}\underset{white\,ppt}{\mathop{2CuCN}}\,+{{(CN)}_{2}}\] \[3KCN+CuCN\xrightarrow{{}}\underset{(soluble\,complex)}{\mathop{\underset{\text{potassium}\,\text{cuprocyanide}}{\mathop{{{K}_{3}}[Cu{{(CN)}_{4}}]}}\,}}\,\]
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