A) \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]
B) \[Cu(CN)\]
C) \[Cu{{(CN)}_{2}}\]
D) \[{{K}_{4}}[Cu{{(CN)}_{6}}]\]
Correct Answer: A
Solution :
\[CuS{{O}_{4}}+2KCN\to Cu{{(CN)}_{2}}+{{K}_{2}}S{{O}_{4}}\] \[2Cu{{(CN)}_{2}}\to C{{u}_{2}}{{(CN)}_{2}}+{{(CN)}_{2}}\] \[\begin{align} & \underline{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,C{{u}_{2}}{{(CN)}_{2}}+6KCN\to 2{{K}_{3}}Cu{{(CN)}_{4}}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\ & \underline{2CuS{{O}_{4}}+10KCN\to 2{{K}_{3}}Cu{{(CN)}_{4}}+2{{K}_{2}}S{{O}_{4}}+{{(CN)}_{2}}} \\ \end{align}\]
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