An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain?

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Solution

Iron lies above copper in the activity series. This means that iron metal will replace copper from copper sulphate solution. As a result of this reaction, ferrous sulphate will be formed and the solution will be light green in colour.

$F e$ + $C u S O_{4} (a q)$ $\to$ $C u (s)$ + $F e S O_{4} (a q)$

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An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain?

Iron lies above copper in the activity series. This means that iron metal will replace copper from copper sulphate solution. As a result of this reaction, ferrous sulphate will be formed and the solution will be light green in colour. Fe + CuSO4(aq) → Cu(s) + FeSO4(aq)