Подчеркните лишнее вещество, и напишите, к какому классу негранных соединений оно относится.
1. Ca, MgO, NaCI, H2SO4
2. SO2, H2CO3, Na2O, CuO
3. K2O, Ag2O, CO2, FeO
4. HCl, H2CO3, K2SO4, H3PO4
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