Question

Give reason
Blue solutions of copper sulphate changes to green when a piece of iron is added to this solution.​

Answer 1

Answer:

This is because the blue colour of copper sulphate solution fades and eventually turns into light green due to the formation of ferrous sulphate.

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Answer 2

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

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