A student placed a clean iron nail in blue coloured copper sulphate solution for a considerable time. He observes that :

What happens when iron nails are put into copper sulphate solution?

An iron nail is suspended in copper sulphate solution are kept for a while. It is observed that the solution.

What will happen when iron nails dipped in copper sulphate solution?

On keeping iron nails in a blue coloured copper sulphate solution, it is observed that the colour of the solution turns light green after sometime. Give reasons for this colour change. Name the type of reaction.

The reaction of iron nail with copper sulphate solution is _________ reaction