NCERT Exercise 5.14 - Coordination Compounds
Question: What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?
Answer: **NCERT answer:** [Cu(H2O)4]2+ + 4 CN– ® [Cu(CN)4]2- + 4H2O As CN¯ is a strong ligand, it forms a highly stable complex with Cu2+ ion. On passing H2S, free Cu2+ ions are not available to form the p...
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