September 2021 1 9 Report
Определите степени окисления атомов в соединениях:
Fe2O3 CaBr2 K2Cr2O7 MnO2 K2MnO4 Mn2O7 MgSO4 Cl2O5 Ba(NO3)2 CrCl3 CrSO4 Na2Cr2O7
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