В перечне веществ к солям относятся:
1) SiO2, NaO2, Al2O3
2) CaSО4, FeCO3, Ba3(Po4)2
3) CaO, NaCl, Al2O3
4)Al2O3, NaOH, CaCl

Формула кислоты:
1) H2CO3
2) CaCO3
3) H2O
4) Ca (OH)2
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