Укажите реакцию, которая не протекает:
Выберите один ответ: 
1/ Fe + ZnSO4 = FeSO4 + Zn
2/ 3Fe + 4H2O = Fe3O4 + 4H2↑
3/ Cr2O3 + 2Al = Al2O3 + 2Cr
4/ Fe + CuSO4 = FeSO4 + Cu
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