Question

In an experiment, an iron nail is dipped in copper sulphate solution. What will be the final colour of the solution?

Answer 1

$CuS{O}_4$ is a blue colour solution. When iron nails kept in copper sulphate solution there is a reaction between them as As Iron is more reactive than Copper it can replace Copper from $CuS{O}_4$ as

$Fe+CuS{O}_4\to FeS{O}_4+Cu$

So, the blue colour solution changes to green.