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`CuSO_(4)` decolourises on addition `KCN` , the produce is

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`CuSO_(4)` decolourises on addition `KCN` , the produce is
A. `[Cu(CN)_(4)]^(2-)`
B. `Cu^(2+)` get redoced is form `[Cu(CN)_(4)]^(3-)`
C. `Cu(CN)_(2)`
D. `CuCN`
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Correct Answer - d
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