[MP PMT 1992; IIT 1996; UPSEAT 2001, 02]
A) $ Cu{{(CN)}_2} $
B) $ Cu(CN) $
C) $ K_2[ Cu{{(CN)}_4} ] $
D) $ K_3[ Cu{{( CN )}_4} ] $
Correct Answer: D
$ 4KCN+CuSO_4\to \underset{\text{Potassium tetracyno cuprate}}{\mathop{K_3[Cu{{(CN)}_4}]}}, $
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