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

solution:
When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it
Therefore, the blue colour of copper sulphate solution fades and green colour appears.
Editor

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