Здійсніть перетворення :
1. CaCO3 → CO2 → H2CO3 → Na2CO3 → NaHCO3.
2. S → SO2 → SO3 → H2SO4 → Na2SO4 → BaSO4;
3. N2 → NO → NO2 → HNO3 → Ca(NO3)2.​
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