Question

What is the redox reaction of (i don't understand how to do this):
MnO4-(aq) + H2O2(aq) -> Mn2+(aq) + O2(g)

Answer 1

Here is a site that tells how to balance redox equatins AND it also will help if you require it for determining oxidations state etc.
http://www.chemteam.info/Redox/Redox.html