Use oxidation numbers to identify reaction is REDOX reactions.
a. 2SO2(g) + O2(g) -> 2SO2(g)
for 2SO2 I got: -2 for S, -2 for O
for O2 I got 0
for 2SO2 I got -2 for S again, and -2 again for 0
Therefore I lost one oxygen and a REDOX reaction occured
Am I right?????