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Why does the colour of copper sulphate s...

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

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When an iron nail is dipped in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour. This is because iron is more reactive than copper.
`CuSO_(4) +Fe to FeSO_(4) +Cu`.
Therefore, the blue colour of copper sulphate solution fades and green colour appears.
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