A) \[Cu{{(CN)}_{2}}\]
B) \[{{K}_{2}}[Cu{{(CN)}_{2}}]\]
C) \[K(Cu{{(CN)}_{2}}]\]
D) \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]
Correct Answer: D
Solution :
\[CuS{{O}_{4}}+2\,KCN\to {{K}_{2}}{{O}_{4}}+Cu{{(CN)}_{2}}\] \[2Cu{{(CN)}_{2}}\to 2\,CuCN+CN-CN-C{{N}^{e}}\] \[CuCN+3Ka\to {{K}_{3}}[Cu{{(CN)}_{4}}]\]
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