From the above list, write down the formulas of basic and acidic oxides: K2CO3, Li2O, H2S, Cr2O3, CH4.

From the above list, write down the formulas of basic and acidic oxides: K2CO3, Li2O, H2S, Cr2O3, CH4.NaNO3, CO2, CA (NO3) 2, SiO2, Na2S

Chemicals should be divided into two groups. In the first group we will add all the basic oxides, in the second group we will add acidic oxides.

a) The main oxides include: Li2O – lithium oxide.

b) Acidic oxides include: CO2 – tetravalent carbon monoxide (carbon dioxide).

SiO2 – silicon oxide refers to amphoteric oxides, it can exhibit both basic and acidic properties.

Cr2O3 – trivalent chromium oxide and amphoteric oxide.

The rest of the substances presented in the task do not belong to the class of oxides.