[Boeun]

Mg + ascorbic acid

or

Fe + ascorbic acid

what is first?

and

Do residue one combine Ag???

[Arkcon]

I'm sad to say I don't understand your question, and while this may be a language barrier we can both work on, its also not a well thought out question, to begin with.

I don't understand what you mean by "which is first"  I'm guessing you have both free metals, and you're adding a solution of ascorbic acid.  Fine.  But chemicals don't "wait their turns" but instead both reactions happen (if they happen) so I don't know why you're asking.  As for residue acting on free silver metal, that's going to be unlikely, even if the previous part made sense.

If you want to learn more, you might want to start with the reactivity series on Wikipedia:  http://en.wikipedia.org/wiki/Reactivity_series  Its a garish page, but it will give you good insights.