Carbon monoxide (4) reacts with each of two substances: 1) sodium hydroxide and calcium oxide

Carbon monoxide (4) reacts with each of two substances: 1) sodium hydroxide and calcium oxide 2) calcium oxide and sulfur oxide (4) 3) oxygen and water 4) sodium chloride and nitric oxide (4)

Carbon monoxide (IV), CO2 is an acidic oxide, therefore it necessarily reacts with water, basic oxides and bases.
1) Correct answer.
CO2 + 2NaOH -> Na2CO3 + H2O;
CO2 + CaO -> CaCO3.
2) CO2 + CaO -> CaCO3;
CO2 + SO2 – />, because SO2 is an acidic oxide.
3) CO2 + O2 – />, carbon is already “saturated” with oxygen, therefore, unlike carbon monoxide, carbon dioxide does not support combustion;
CO2 + H2O -> H2CO3.
4) NaCl + CO2 – />, carbon dioxide does not react with salts;
CO2 + NO2 – />, NO2 – acidic oxide.