Question

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

Answer 1

Explanation:

this is because displacement takes place in copper sulphate and iron displaces copper from copper sulphate and form iron sulphate

• CuSO4+Fe---FeSO4+Cu

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)