Question

Why does the colour of copper sulphate solution change from blue to green if an iron nail is placed in the solution of copper sulphate?

Answer 1

In electrochemical series,iron is above the copper.So when iron is placed in copper sulphate solution,it displace the copper from solution and form FeSo4 which is green in colour.


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Answer 2

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.