Question

why does the colour of copper sulphate solution change when iron nail dipped in it

Answer 1

the colour of copper sulphate solution change bcoz iron is more reactive than copper so that colour of the copper sulphate solution changes from blue colour to green colour and the iron nail acquires a brownish colour.

hope this helps u

Answer 2

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When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes.

The reaction involved here is:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)