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Which of the following reactions are redox reactions? Check all that apply

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Which of the following reactions are redox reactions? Check all that apply. 
\ 0 Al(s) + 3Ag f (aq) --4 A13' (aq) 4 3Ag(s) O SO3 (g) + 112 0(1) ---> 112 SO., (aq) 1 i- i Ba(s) 4 C12 (g) --> BaC12 (s) Mg(s) -F Br2 (1) -> MgBr2 (s)