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

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Solution

Reason: 1 Mark
Equation: 1 Mark

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

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

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(4) blue to yellow

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