Как расписать реакции ОВР? 1. 2H2+O2=2H2O

2. Al2O3+3H2=2Al+3H2O

3.CH4+2O2=CO2+2H2O

4. 2Na+2H2O=2NaOH+H2

5. Zn+H2O=ZnO+H2

Ребят, если не трудно, помогите
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