October 2021 0 21 Report
Без изменения степени окисления элементов протекает химическая реакция  1) Cu + 2H2SO4 = CuSO4 + SO2 + 2H2O
 2) H2SO4 + KOH = KHSO4 + H2O
 3) Fe + H2SO4 = FeSO4 + H2
 4) SO2 + Br2 + 2H2O = H2SO4 + 2HBr
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