A) \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]
B) \[Cu(CN)\]
C) \[Cu{{(CN)}_{2}}\]
D) \[{{K}_{4}}[Cu{{(CN)}_{6}}]\]
Correct Answer: A
Solution :
\[CuS{{O}_{4}}\] on reaction with \[KCN\] gives \[{{K}_{3}}[Cu{{(CN)}_{4}}]\] \[2CuS{{O}_{4}}+10KCN\to 2{{K}_{3}}[Cu{{(CN)}_{4}}]+2{{K}_{2}}S{{O}_{4}}+{{(CN)}_{2}}\]
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