Question

with the help of an activity show that iron is more reactive than copper

Answer 1

Iron is less reactive than copper
When iron is added to copper sulphate the copper is displaced by the iron. This happens because iron is more reactive than copper. But when you do the reverse that is, when you put copper turnings in iron sulphate, copper can not replace iron from iron sulphate solution as copper is less reactive than iron.

Answer 2

To show that iron is more reactive than copper-

• At first prepare a solution of copper sulphate by dissolving copper sulphates crystals in water.
• We will get a blue colored solution.
• Now, keep an iron nail dipped in this solution.
• After sometime we will see that the colour of solution changes to dirty green and a reddish-brown powder sticks to the nail.
• Copper in copper sulphate is displaced by iron of the nail, and iron sulphate is formed which is green in colour.
• Thus, it shows that iron is more reactive than copper.

The reaction can be written as-

$\rm { Fe_{(iron)} + CuSO_{4(copper \: sulphate)} \longrightarrow FeSo_{4(iron \: sulphate)} + Cu }$