The third reaction is the only redox reaction - it is the only reaction where any atomic charges have changed (i.e. electrons have been transferred):
(Ag+)(NO3-) + (Na+)(Cl-) -> (Ag+)(Cl-) + (Na+)(NO3-)
(Ba2+)(2Cl-) + (2H+)(SO42-) -> (Ba2+)(SO42-) + 2(H+)(Cl-)
2Na + Cl2 -> 2(Na+)(Cl-)
(Na+)(OH-) + (H+)(Cl-) -> (Na+)(Cl-) + (H+)(OH-)
As you can see, the third reaction is the only reaction where atomic charges have changed; 2Na to 2Na+, and Cl2 to 2Cl-.
(Ag+)(NO3-) + (Na+)(Cl-) -> (Ag+)(Cl-) + (Na+)(NO3-)
(Ba2+)(2Cl-) + (2H+)(SO42-) -> (Ba2+)(SO42-) + 2(H+)(Cl-)
2Na + Cl2 -> 2(Na+)(Cl-)
(Na+)(OH-) + (H+)(Cl-) -> (Na+)(Cl-) + (H+)(OH-)
As you can see, the third reaction is the only reaction where atomic charges have changed; 2Na to 2Na+, and Cl2 to 2Cl-.
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