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IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

$\mathrm{CuSO}_4$ decolourises on addition of KCN , the product is

A

$\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{2-}$

B

$\mathrm{Cu}^{2+}$ get reduced to form $\left[\mathrm{Cu}(\mathrm{CN})_4\right]^{3-}$

C

$\mathrm{Cu}(\mathrm{CN})_2$

D

CuCN

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