Radha arranged three set-ups as shown in the following figures. She observed that reactions take place in all the three experiments. Answer the questions that follow:

Explain why these changes occur.

Explanation

These changes occur because a more reactive metal displaces a less reactive metal from its solution. Iron is more reactive than copper and it can displace copper from its solution. Zinc is more reactive than iron and it can displace iron from its solution. Metal Y is more reactive than zinc.