Question

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

Answer 1

Answer:

It happens because iron is more reactive than copper,so it displaces copper from copper sulphate and form iron sulphate. As a result copper sulphate which is blue in colour changes to iron sulphate which is of green colour.

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Answer 2

Answer:

When an iron nail is dipped in copper sulphate solution(blue colour), its colour changes due to the formation of Ferrous sulphate(green colour).

Reaction taking place:

CuSO4 + Fe -----> FeSO4 + Cu

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