Question

Why does the colour of copper sulphate solution change when
an iron nail is dipped in it?
​

Answer 1

Answer:

The colour of copper sulphate solution changes when an iron nail is dipped in it because iron is more reactive than copper. ... When an "iron nail" dips into the solution of "copper sulphate" than iron, the copper sulphate displaces copper because "iron" is "more reactive" than "copper".

Answer 2

Explanation:

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.