I have the following equation, already written, with a few coefficients to write.
$\ce{2MnO4^- + a H2O2 + b H+ -> 2Mn^2+ +c O2 + dH2O}$
I have put a = 1, b = 6, c = 3 and d = 4.
The number of atoms and the charges appear balanced to me. It is wrong, so where am I mistaking?
EDIT:I have just noticed that the exercise says "under acidic conditions": may it help?