Question

Why colour of copper sulphate solution is discharged after sometime when iron rod is dipped into it,
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Answer 1

Answer:

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.

Explanation:

Hope it helps

Answer 2

Answer:

because iron is more reactive than copper iron displaces copper from its solution due to which colour of copper sulphate solution is discharged