Colour of CuSo4 solution changes to light green when iron fil
ings are added.
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The Iron(Fe) displaces the Copper(Cu) as it is higher on the reactivity series.
The colour of FeSO4 is pale green in its hydrous form.
CuSO4 + Fe = FeSO4 + Cu
The copper deposits on the iron object.
It is a displacement reaction.
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