Arrange the following metals in the order in which they displace each other from the solution of their salts. `Al, Cu, Fe, Mg, ` and `Zn`.

Explanation

To arrange the metals Al, Cu, Fe, Mg, and Zn in the order of their ability to displace each other from the solutions of their salts, we need to consider their reactivity. The more reactive a metal is, the more readily it will displace a less reactive metal from its salt solution.

### Step-by-Step Solution:

1. **Understand Reactivity Series**: The reactivity series is a list of metals arranged in order of decreasing reactivity. In this series, more reactive metals can displace less reactive metals from their salt solutions.

2. **Identify the Metals**: The metals we need to arrange are:
- Aluminum (Al)
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