A) $ Cu( CN ) $
B) $ Cu{{( CN )}_2} $
C) $ K_3[Cu{{( CN )}_4}] $
D) $ K_4[Cu{{(CN)}_6}] $
Correct Answer: C
$ 2CuSO_4+10KCN\xrightarrow{{}} $ $ 2K_3[Cu{{(CN)}_4}]+2K_2SO_4+{{(CN)}_2} $
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