Posted by Cierra on Monday, January 14, 2008 at 4:05pm.
Cr is high enough in the activity series that it will displace hydrogen ion from the acid. Mg metal is above Al in the activity series; therefore, Mg metal will displace aluminum ion from AlBr3.
Here is a site that gives the activity series.
http://en.wikipedia.org/wiki/Reactivity_series
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