Coordination Compounds 2 Question 44
####46. Which of the following is formed when excess of $KCN$ is added to aqueous solution of copper sulphate?
(1996, 1M)
(a) $Cu(CN) _2$
(b) $K _2\left[Cu(CN) _4\right]$
(c) $K\left[Cu(CN) _2\right]$
(d) $K _3\left[Cu(CN) _4\right]$
Show Answer
Solution:
- $Cu^{2+}+CN^{-} \longrightarrow CuCN \downarrow$
$CuCN+3 CN^{-} \longrightarrow\left[Cu(CN) _4\right]^{3-}$
