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A metal of stronger reducing power displaces another metal of weaker reducing power from its solution of salt .
The order of the increasing reducing power of the given metals is `Cu lt Fe lt Zn lt Al lt Mg.` ltbgt Hence , we can say that Mg can displace Al from its salt solution, but Al cannot displace Mg.
Thus , the order in which the given metals displace each other from the solution of their salts is given below :
`Mg gt Al gt Zn gt Fe gt Cu`
Correct Answer – D
Since a metal with lower electrode potential is a stronger reducing agent, Mg can displace all the given metals, Al can displace all metals except Mg. Zn can displace all metals except Mg and Al. Fe can displace only Cu. The order in which they can displace each other from their salt solutions is Mg, Al, Zn, Fe, Cu.