(a) What colour changes do you observe when :
(I) you add Zinc to a solution of copper sulphate ?
(ii) you add lead to a solution of cupric chloride ?
Write a balanced chemical equation

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Solution

Dear student,

(i) when Zn is added in copper sulphate solution which is blue in colour , it gives zinc sulphate and copper as;
$Z n + C u S O_{4} \to Z n S O_{4} + C u$
The formed zinc sulphate is colourless salt hence , brown colour of copper settle at the bottom of flask.
The blue colour changes to colourless

(ii) when we add lead to cupric chloride solution which is blue-green colour in nature formed the product lead chloride and copper as:
$P b + C u C l_{2} \to P b C l_{2} + C u$
The colour of formed product lead chloride is white (colourless)
The colour change is from blue-green to colouless
In both the cases we get colourless solution

Regards

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