A) \[{{[Cu{{(CN)}_{4}}]}^{3-}},{{(CN)}_{2}}\]
B) \[CuCN,{{(CN)}_{2}}\]
C) \[{{[Cu{{(CN)}_{4}}]}^{2-}},{{(CN)}_{2}}\]
D) \[Cu{{\left( CN \right)}_{2}},{{K}_{2}}S\]
Correct Answer: A
Solution :
[a] \[CuS{{O}_{4}}\left( aq. \right)\xrightarrow{{{H}_{2}}S}\underset{\begin{smallmatrix} Blanck\,ppt. \\ (M) \end{smallmatrix}}{\mathop{2CuS}}\,~\xrightarrow[Excess]{KCN}\] \[{{\left[ \underset{(N)}{\mathop{Cu}}\,{{\left( CN \right)}_{4}} \right]}^{3}}^{-}+\underset{(O)}{\mathop{{{\left( CN \right)}_{2}}}}\,\uparrow \]
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