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Which compound is formed when excess of KCN is added t to aqueous s olution of copper sulphate?
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Which compound is formed when excess of KCN is added t to aqueous s ol...
2CuSO4 (aq) + 10 KCN 2K3 [Cu(CN)4] +2K2SO4 + (CN)2 Thus, the co-ordination entity formed is [Cu(CN)4]3?. Since CN? is a strong ligand, the complex is stable. When H2S is passed through this solution, no ppt. of Cu2S is formed because Cu ions are not lost when these are present in the co-ordination sphere.   
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Which compound is formed when excess of KCN is added t to aqueous s olution of copper sulphate?
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