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У якій із наведених реакцій сполука Феруму є окисником?
А) Fe2O3 + 3KNO3 + 3KOH = 2K2FeO4 + 3KNO2 + 2H2O
Б) Fe2O3 + 2Al = 2Fe + Al2O3
В ) 10FeSO4 + 2KMnO4 + 8H2SO4 = 5Fe2 (SO4 )3 + 2MnSO4 + K2SO4 + 8H2O
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