Which of the following is formed in solution when is treated with KCN till the colour…

CHEMISTRY · Single correct · CBSE · Chemistry · Coordination Compounds · Coordination Compounds

Problem

Which of the following is formed in solution when

[\text{Cu}(\text{NH}_3)_4]^{2+}

is treated with KCN till the colour of the complex is discharged? (1)

\text{Cu}(\text{CN})_2

(2)

[\text{Cu}(\text{CN})_4]^{2-}

(3)

[\text{Cu}(\text{CN})_4]^{3-}

(4)

[\text{Cu}(\text{CN})_6]^{4-}