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2KMnO4 4K2SO3 H2O → MnO2 K2SO4 KОН2Fe 6H2SO4(đ, nóng) → Fe2(SO4)3 3SO2 6H2O K2Cr2O7 6FeSO4 7H2SO4 → Cr2(SO4)3 3Fe2(SO4)3 K2SO4 7H2O2KCrO4 3(NH4)2S 2H2O → 2Cr(OH)3 3S 6NH3 4KOH CrSO4 O2 H2SO4 → 2Cr2(SO4)3 2H2O133 4FeCr204 8Na2CO3 7028 Na2CrO4 2Fe2O3 8CO2 Fe 6 HNO3 (đ, nóng) → Fe(NO3)3 3 NO2 3 H2O47Fe 4HNO3(I) → Fe(NO3)3 NO 2H2O Na2Cr2O7 2 C Cr2O3 Na2CO3 CO1 → Cu 2H2SO4(đ, nóng) → CuSO4 SO2 2H2O Na2Cr2O7 2 C Cr2O3 Na2CO3 CO1 → Cu 2H2SO4(đ, nóng) → CuSO4 SO2 2H2O 2KMnO4 10FeSO4 8H2SO4 → 2MnSO4 5Fe2
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