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Question -

Whatis the coordination entity formed when excess of aqueous KCN is added to anaqueous solution of copper sulphate? 



Answer -

Why is it that no precipitate of copper sulphide is obtained when H_2S(g) is passed through this solution?


Answer
i.e.,
Thus, the coordination entity formed in the process is K2[Cu(CN)4].  is a very stable complex, which does not ionize to give Cu2+ ions when added to water. Hence, Cu2+ ions are not precipitated when H2S(g) is passed through the solution.

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