Manish was given aqueous solutions of silver nitrate, zinc sulphate and an iron nail. In the first experiment, he dipped iron nail in silver nitrate solution and observed that the solution turned brown. In second experiment, he dipped iron nail in zinc sulphate solution. However, no change was observed.
Based on the above information, answer the following questions.
Based on your observation, arrange Ag, Zn and Fe in decreasing order of their reactivity.

Explanation

The decreasing order of reactivity is Zn gt Fe gt Ag.