An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain. [2 MARKS]

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Solution

Each point: 1 Mark

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

$Fe$ + $Cu S O_{4} (aq)$ $\to$ $Cu (s)$ + $Fe S O_{4} (aq)$

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