Why does the colour of copper sulphate change when an iron nail is kept in it? Justify your answer.

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Solution

Blue colour of copper sulphate solution changes into green colour & then iron nail acquires a brownish look. This is because that iron is more reactive than copper.

$F e + C u S O_{4} \to F e S O_{4} + C u$
In this reaction, iron displaces copper from $C u S O_{4}$ solution.

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