3a) Balance the oxidation-reduction reactions that occur in basic solution using half-reaction method
Al(s) + MnO4<-> (aq) = MnO2(s) + Al(OH)4<->(aq)
3b) Same method:
NO2<-> (aq) + Al(s) = NH3(g) + AlO2<->(aq)
The solution is given step-by-step in an attachment. The expert balances a redox that occurs in basic using 1.2 reaction methods.