Question

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

Answer 1

A metal having stronger reducing power displaces another metal having weaker reducing power from its salt solution.
The increasing order of reducing power is $Cu<Fe<Zn<Al<Mg$.

Thus, Mg can displace Al from its salt solution but Al cannot displace Mg.

The order in which the metals displace each other from their salt solutions is $Mg>Al>Zn>Fe>Cu$.