November 2021 1 2 Report
Випишіть формули оксидів: 1)CaO; H2SO4; 2)Na2O; 3) Fe2O3; 4)KOH; 5) SO3; 6)B2O3; 7)HNO3; 8) H2O2; 9)Cl2O7 10) NaOH
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