Sodium nitrate was fused with chromium oxide in the presence of sodium carbonate. The gas released in this case reacted

Sodium nitrate was fused with chromium oxide in the presence of sodium carbonate. The gas released in this case reacted with an excess of barium hydroxide solution with the formation of a white precipitate. The precipitate was dissolved in an excess of hydrochloric acid solution, and silver nitrate was added to the resulting solution until precipitation ceased. Write the equations for the described reactions.

3NaNO3 + Cr2O3 + 2NaCO3 → 2Na2CrO4 + 3NaNO2 + 2CO2
CO2 + Ba(OH)2 → BaCO3↓ + H2O
BaCO3 + 2HCl → BaCl2 + CO2↑ + H2O
BaCl2 + 2AgNO3 → 2AgCl↑ + Ba(NO3)2

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.