7)Окислительно-восстановительной реакции соответствует уравнение
1) Fe2O3 + 3H2 = 2Fe + 3Н2О
2) H2S + CаO = CаS + H2O
3) SO3 + 2NaOН = Na2SO4 + Н2О
4) H2SO4 + Zn(OH)2 = ZnSO4 + 2Н2О
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