5. Определите ряд, где находятся формулы только оксидов:
а) HCO3, HNO3, H,0, Cl,0, MgO
б) К,0, кон, NaNO3, H3PO4, CO2
B) H2SO4, NaOH, SiO2, HCIO, P205
г) SO3, Cl,07, MgO, SiO2, CO, H,0​
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