Question

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

Answer 1

Answer:

copper sulphate react with iron to form iron sulphate and copper

colour of copper sulphate change from blue to light green and iron to brownish colour

This takes place because copper is less reactive than zinc

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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)