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I think that sopmething does still happen to the iron nail. i believe it is protected by cathodic protection due to the oxidation of the Mg strip. Therefore if there was any rust on the nail before it was placed in the solution the rust would be restored to metallic iron and be reduced.

You guys, it's a displacement reaction that occurs due to the presence of a more active metal(Mg) in the solution of a less active metal ion(Fe2+). Because magnesium is higher on the activity series than iron, it will preferentially oxidise and transfer its electrons to the Fe2+ ions- which is...