Question

Why does the colour of copper sulphate changes when iron nails are placed into it

Answer 1

When iron nails are added to a solution of copper sulphate then displacement reaction takes place and ferrous sulphate is formed with copper being deposited on nails.Copper sulphate solution that is basically blue changes to green after addition of iron.
CuSO4+Fe---FeSO4+Cu

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Answer 2

hi
here is your answer
the colour changes as iron is more reactive than copper so copper sulphate + iron = iron sulphate + copper
the colour of iron sulphate is green so the colour changes from blue to green
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