Question
When $\ce{KCN}$ is added to $\ce{CuSO_{4}}$ solution, there is formation of the stable water soluble complex. This complex is:
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Answer
When $\ce{KCN}$ is added to $\ce{CuSO_4}$ solution, the following reaction occurs. $\ce{4KCN+CuSO_{4 }\rightarrow K_3[Cu(CN)_{4}].}$
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