Question

Give reason why colour of copper sulphate solution changes when iron nail is dipped in it

Answer 1

iron is more reactive than copper, so it displaces it from its aqueous solution of copper sulphate to firm iron sulphate, which is green

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)