Помогите ПЖПЖПЖ Выберите две реакции получения водорода в лаборатории
1)2H2O = 2H2 + O2
2) 2K+ 2H2O = 2KOH + H2
3)Zn + H2SO4 = ZnSO4 + H2
4)CH4 = C +2H2
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