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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Solution

Aqueous copper sulphate solution is blue in colour due to presence of $[C u (H_{2} O)_{4}]^{2 +}$ ions.
(i) It reacts with KF to form green coloured $[C u F_{4}]^{2 -}$ .
$[C u (H_{2} O)_{4}]^{2 +} + 4 F^{-} \to [C u F_{4}]^{2 -}$
It reacts with KCl to form bright green coloured $[C u C l_{4}]^{2 -}$ .
$[C u (H_{2} O)_{4}]^{2 +} + 4 C l^{-} \to [C u C l_{4}]^{2 -}$
In both examples, the weak field ligand water is replaced by fluoride and chloride ions.

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C u S O_{4}

Select the correct answers :

(a) Colour of an aqueous solution of copper sulphate is

(i) Green (ii) Brown (iii) Blue (iv) Yellow

(b) Colour of the precipitate formed on adding $N a O H$ solution to iron (II) sulphate solution is

(i) White (ii) Brown (iii) Green (iv) Pale blue

(i) Iron (ii) Magnesium (iii) Zinc (iv) Copper

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