Which compound is formed when an excess of KC | vedclass

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(D) When an excess of $KCN$ is added to an aqueous solution of copper sulphate $(CuSO_4)$,the initial precipitate of copper$(II)$ cyanide $(Cu(CN)_2)$

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$K_3[Cu(CN)_4]$

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(D) When an excess of $KCN$ is added to an aqueous solution of copper sulphate $(CuSO_4)$,the initial precipitate of copper$(II)$ cyanide $(Cu(CN)_2)$ is unstable and decomposes to form copper$(I)$ cyanide $(CuCN)$ and cyanogen gas $((CN)_2)$.Upon adding an excess of $KCN$,the $CuCN$ dissolves to form the stable complex potassium tetracyanocuprate$(I)$,which is $K_3[Cu(CN)_4]$.The overall balanced chemical equation is:$2CuSO_4 + 10KCN \rightarrow 2K_3[Cu(CN)_4] + (CN)_2 + 2K_2SO_4$

Which compound is formed when an excess of $KCN$ is added to an aqueous solution of copper sulphate?

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