Question

What happens when an iron nail is kept immersed in copper sulphate solution like activity?

Answer 1

when an iron nail is kept immersed in copper sulphate solution then Iron replaces the copper from solution and becomes
FeSo4 and Cu .
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Answer 2

What happens when nails kept into a copper sulphate solution?

When an iron nail is kept in copper sulphate solution, a reddish brown coating is seen on the iron nail after sometime.

Also, the colour of the copper sulphate solution changes from blue to green.