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Aqueous copper sulphate solution (blue in colour) gives :

(i) A green precipitate with aqueous potassium fluoride and 

(ii) A bright green solution with aqueous potassium chloride. Explain these experimental results.

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Aqueous copper sulphate contains a coordination entity, [Cu(H2O)4]2+ which is blue in colour. Water molecule is a weaker ligand than Cl- and F-.

1. On addition of aqueous KF solution, a new complex entity is formed which is green in colour.

2. On addition of aqueous solution of KCl, an another bright green complex entity is formed which is soluble in water.

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