4.Укажіть групу речовин, яка містить лише солі: А)CaCO3, CO2, CaCl2.
Б)Na2SiO3, H2SiO3, Na2CO3
B)К3РО4, КОН, AICI3.
Г)СаСІ2, ZnSO4, NaNO3.
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