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  4. When CuSO4 solution is treated with an excess of KCN, a colourless complex salt in which copper has a d10 configuration is obtained. This complex is

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Q. When $CuSO_4$ solution is treated with an excess of $KCN$, a colourless complex salt in which copper has a $d^{10}$ configuration is obtained. This complex is

UP CPMTUP CPMT 2014The d-and f-Block Elements

Solution:

$CuSO_{4} +2KCN \to2Cu \left(CN\right)_{2} + K_{2}SO_{4}$
$2Cu \left(CN\right)_{2} \to2CuCN + \left(CN\right)_{2}$
$ Cu CN +3KCN \to K_{3}\left[Cu\left(CN\right)_{4}\right]$