Пожалуйста помогите!!!
Выберите реакции, в которых сера проявляет восстановительные свойства:
1) 2H2S + SO2 = 3S + 2H2O
2) H2SO4 + BaCl2 = BaSO4 + 2HCl
3) 2HNO3 + 3H2SO3 = 3H2SO4 +2NO + H2O
3) Fe + S = FeS
4) 3S + KClO3 = 3SO2 + 2KCl
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