СРОЧНО!
Виписати оксиди та назвати їх: KOH, CO, CrO3, O3, B2O3, HNO3, N2O5
2.О2: Ba, MgS, C3H8, Li, SiH4 ,K
3.NaClO3→O2→CuO →Cu→ Cu2O
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