Question

an iron knife kept in blue copper sulphate solution turns the blue solution into light green why?​

Answer 1

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

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$Fe(s) + CuSO_4(aq) ----> FeSO_4(aq) + Cu(s)$

This is a single displacement reaction.

Answer 2

The reason behind the colour change is displacement reaction of iron and Copper .

Iron is more reactive than copper so it displace copper from copper sulphate solution and make it iron sulphate

Fe+CuSO⁴----->FeSO⁴+Cu