Объяснение:
S + O 2 = SO 2 ,
2Zn + O2 = 2ZnO,
4Cr + 3O2 = Cr2О3
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Объяснение:
S + O 2 = SO 2 ,
2Zn + O2 = 2ZnO,
4Cr + 3O2 = Cr2О3