Question

выберите лишнюю формулу в каждом ряду, и укажите признак по которому вы выбрали лишнюю формулу: а)hno3, h2so4, h2co3, h3po4 б) cuso4, na2sio3, caco3, agno3 в)koh, lioh,mg(oh)2, ba(oh)2 u)co2, n2o5, so3, fe2o3

Answer 1

а) H2CO3 - слабая кислота

б) CaCO3 - нерастворимая в воде соль

в) Mg(OH)2 - нерастворимое основание

г) Fe2O3 - амфотерный оксид

Answer 2

The question you asked is about choosing the odd formula in each row and indicating the criterion by which you chose it. Here is a detailed answer:

- a) HNO3, H2SO4, H2CO3, H3PO4 The odd formula in this row is H2CO3, because it is the only one that is a weak acid. The rest are strong acids that completely dissociate in water. - b) CuSO4, Na2SiO3, CaCO3, AgNO3 The odd formula in this row is CaCO3, because it is the only one that is insoluble in water. The rest are soluble salts that form clear solutions. - c) KOH, LiOH, Mg(OH)2, Ba(OH)2 The odd formula in this row is Mg(OH)2, because it is the only one that is a slightly soluble base. The rest are strong bases that fully dissociate in water. - d) CO2, N2O5, SO3, Fe2O3 The odd formula in this row is Fe2O3, because it is the only one that is a compound of a metal and a nonmetal. The rest are nonmetal oxides that form acidic solutions.

I hope this helps you understand the topic better.