When excess of aqueous KCN solution is added to an aqueous solution of copper sulphate…
Chemistry · Class 12 · CBSE — Coordination Compounds
When excess of aqueous KCN solution is added to an aqueous solution of copper sulphate, the complex [Cu(CN)4]2– is formed. On passing H2S gas through this solution no precipitate of CuS is formed because
- sulphide ions cannot replace CN– ions
- [Cu(CN)4]2– does not give Cu2+ ion in the solution
- sulphide ions from H2S do not form complexes
- sulphide ions cannot replace sulphate ions from copper sulphate solution.
Answer
(B) [Cu(CN) 4 ] 2– does not give Cu 2+ ion in the solution
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